Android 将onClick listener添加到按钮时，数据库应用程序崩溃
我一直在尝试像以前一样建立一个简单的数据库。但是，当我将onClick listener添加到我的两个按钮时，这个单页应用程序就崩溃了。这是一个非常简单的应用程序，可以将玩家姓名和分数添加到数据库中，然后按姓名查找分数。早些时候，我的布局在fragment_main.xml中，但我将其更改为activity_main.xml。下面是我的MainActivity、数据库适配器、布局xml和LogCat的代码Android 将onClick listener添加到按钮时，数据库应用程序崩溃,android,xml,database,android-fragments,android-sqlite,Android,Xml,Database,Android Fragments,Android Sqlite,我一直在尝试像以前一样建立一个简单的数据库。但是，当我将onClick listener添加到我的两个按钮时，这个单页应用程序就崩溃了。这是一个非常简单的应用程序，可以将玩家姓名和分数添加到数据库中，然后按姓名查找分数。早些时候，我的布局在fragment_main.xml中，但我将其更改为activity_main.xml。下面是我的MainActivity、数据库适配器、布局xml和LogCat的代码 public class MainActivity extends ActionBarAc
public class MainActivity extends ActionBarActivity {
Button add, find;
EditText name, score;
private DBAdapter dbHelper;
private boolean isUpdate = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
dbHelper = new DBAdapter(this);
name = (EditText) findViewById(R.id.editText1);
score = (EditText) findViewById(R.id.editText2);
add = (Button) findViewById(R.id.button1);
find = (Button) findViewById(R.id.button2);
}
public void newPlayer(View view){
dbHelper = new DBAdapter(this);
String pName = name.getText().toString();
int pScore = Integer.parseInt(score.getText().toString());
Player player = new Player(pName, pScore);
dbHelper.addPlayer(player);
name.setText("D");
score.setText("1");
}
public void findPlayer(){
dbHelper = new DBAdapter(this);
Player player = dbHelper.getPlayerByName(name.getText().toString());
if (player != null){
score.setText(player.getScore());
}
else {
Toast.makeText(this, "Couldn't find in database", Toast.LENGTH_LONG).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_main, container,
false);
return rootView;
}
}
}
package com.example.anotherdatabase;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
public class DBAdapter extends SQLiteOpenHelper {
private static final int DB_VERSION = 1;
private static final String DB_NAME = "ItemDB.db";
Context context;
private static final String TABLE_ITEM = "Players";
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_SCORE = "score";
private static final String[] COLUMNS = {KEY_ID,KEY_NAME,KEY_SCORE};
public DBAdapter(Context context) {
super(context, DB_NAME, null, DB_VERSION);
this.context = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_ITEM_TABLE = "CREATE TABLE "+ TABLE_ITEM +"( " +
"id INTEGER PRIMARY KEY AUTOINCREMENT, " +
"name TEXT, "+
"score INTEGER )";
db.execSQL(CREATE_ITEM_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS "+TABLE_ITEM);
// create fresh Items table
this.onCreate(db);
}
public void addPlayer(Player player){
// get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, player.getName());
values.put(KEY_SCORE, player.getScore());
// insert
long insert = db.insert(TABLE_ITEM, null, values);
if(insert == -1){
Toast.makeText(context, "Failed to save to the database", Toast.LENGTH_LONG).show();
}
// close
db.close();
}
public Player getPlayerById(int id){
// 1. get reference to readable DB
SQLiteDatabase db = this.getReadableDatabase();
// 2. build query
Cursor cursor =
db.query(TABLE_ITEM,
COLUMNS,
" id = ?",
new String[] { String.valueOf(id) },
null,
null,
null,
null);
// 3. if we got results get the first one
if (cursor != null)
cursor.moveToFirst();
// 4. build Item object
Player player = new Player();
player.setId(Integer.parseInt(cursor.getString(0)));
player.setName(cursor.getString(1));
player.setScore(Integer.parseInt(cursor.getString(2)));
db.close();
return player;
}
public Player getPlayerByName(String name){
// 1. get reference to readable DB
SQLiteDatabase db = this.getReadableDatabase();
// 2. build query
Cursor cursor =
db.query(TABLE_ITEM,
COLUMNS,
" name = ?",
new String[]{name},
null,
null,
null,
null);
// 3. if we got results get the first one
if (cursor != null)
cursor.moveToFirst();
// 4. build Item object
Player player = new Player();
player.setId(Integer.parseInt(cursor.getString(0)));
player.setName(cursor.getString(1));
player.setScore(Integer.parseInt(cursor.getString(2)));
db.close();
return player;
}
public Player updatePlayer(Player player) {
SQLiteDatabase db = this.getWritableDatabase();
// create ContentValues to add key "column"/value
ContentValues values = new ContentValues();
values.put(KEY_NAME, player.getName());
values.put(KEY_SCORE, player.getScore());
// insert
int i = db.update(TABLE_ITEM, values, KEY_ID + "= ?", new String[]{String.valueOf(player.getId())} );
Log.d("number of rows updated:", i+"");
// close
db.close();
return null;
}
public int deletePlayerById(String playerId) {
// 1. get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
// 2. delete
int result = db.delete(TABLE_ITEM,
KEY_ID+" = ?",
new String[] { playerId });
// 3. close
db.close();
return result;
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.anotherdatabase.MainActivity"
tools:ignore="MergeRootFrame" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editText2"
android:layout_marginLeft="36dp"
android:layout_marginTop="28dp"
android:text="Add"
android:onClick="newPlayer" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_alignRight="@+id/editText2"
android:text="Find"
android:onClick="findPlayer" />
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText1"
android:layout_centerHorizontal="true"
android:layout_marginTop="39dp"
android:ems="10" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText2"
android:layout_alignParentTop="true"
android:layout_marginTop="14dp"
android:ems="10" />
</RelativeLayout>
package com.example.anotherdatabase;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
public class DBAdapter extends SQLiteOpenHelper {
private static final int DB_VERSION = 1;
private static final String DB_NAME = "ItemDB.db";
Context context;
private static final String TABLE_ITEM = "Players";
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_SCORE = "score";
private static final String[] COLUMNS = {KEY_ID,KEY_NAME,KEY_SCORE};
public DBAdapter(Context context) {
super(context, DB_NAME, null, DB_VERSION);
this.context = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_ITEM_TABLE = "CREATE TABLE "+ TABLE_ITEM +"( " +
"id INTEGER PRIMARY KEY AUTOINCREMENT, " +
"name TEXT, "+
"score INTEGER )";
db.execSQL(CREATE_ITEM_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS "+TABLE_ITEM);
// create fresh Items table
this.onCreate(db);
}
public void addPlayer(Player player){
// get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, player.getName());
values.put(KEY_SCORE, player.getScore());
// insert
long insert = db.insert(TABLE_ITEM, null, values);
if(insert == -1){
Toast.makeText(context, "Failed to save to the database", Toast.LENGTH_LONG).show();
}
// close
db.close();
}
public Player getPlayerById(int id){
// 1. get reference to readable DB
SQLiteDatabase db = this.getReadableDatabase();
// 2. build query
Cursor cursor =
db.query(TABLE_ITEM,
COLUMNS,
" id = ?",
new String[] { String.valueOf(id) },
null,
null,
null,
null);
// 3. if we got results get the first one
if (cursor != null)
cursor.moveToFirst();
// 4. build Item object
Player player = new Player();
player.setId(Integer.parseInt(cursor.getString(0)));
player.setName(cursor.getString(1));
player.setScore(Integer.parseInt(cursor.getString(2)));
db.close();
return player;
}
public Player getPlayerByName(String name){
// 1. get reference to readable DB
SQLiteDatabase db = this.getReadableDatabase();
// 2. build query
Cursor cursor =
db.query(TABLE_ITEM,
COLUMNS,
" name = ?",
new String[]{name},
null,
null,
null,
null);
// 3. if we got results get the first one
if (cursor != null)
cursor.moveToFirst();
// 4. build Item object
Player player = new Player();
player.setId(Integer.parseInt(cursor.getString(0)));
player.setName(cursor.getString(1));
player.setScore(Integer.parseInt(cursor.getString(2)));
db.close();
return player;
}
public Player updatePlayer(Player player) {
SQLiteDatabase db = this.getWritableDatabase();
// create ContentValues to add key "column"/value
ContentValues values = new ContentValues();
values.put(KEY_NAME, player.getName());
values.put(KEY_SCORE, player.getScore());
// insert
int i = db.update(TABLE_ITEM, values, KEY_ID + "= ?", new String[]{String.valueOf(player.getId())} );
Log.d("number of rows updated:", i+"");
// close
db.close();
return null;
}
public int deletePlayerById(String playerId) {
// 1. get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
// 2. delete
int result = db.delete(TABLE_ITEM,
KEY_ID+" = ?",
new String[] { playerId });
// 3. close
db.close();
return result;
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.anotherdatabase.MainActivity"
tools:ignore="MergeRootFrame" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/editText2"
android:layout_marginLeft="36dp"
android:layout_marginTop="28dp"
android:text="Add"
android:onClick="newPlayer" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_alignRight="@+id/editText2"
android:text="Find"
android:onClick="findPlayer" />
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText1"
android:layout_centerHorizontal="true"
android:layout_marginTop="39dp"
android:ems="10" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText2"
android:layout_alignParentTop="true"
android:layout_marginTop="14dp"
android:ems="10" />
</RelativeLayout>
07-10 11:29:59.423: D/AndroidRuntime(26313): Shutting down VM
07-10 11:29:59.423: W/dalvikvm(26313): threadid=1: thread exiting with uncaught exception (group=0x4174bba8)
07-10 11:29:59.423: E/AndroidRuntime(26313): FATAL EXCEPTION: main
07-10 11:29:59.423: E/AndroidRuntime(26313): Process: com.example.anotherdatabase, PID: 26313
07-10 11:29:59.423: E/AndroidRuntime(26313): java.lang.IllegalStateException: Could not execute method of the activity
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.view.View$1.onClick(View.java:3823)
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.view.View.performClick(View.java:4438)
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.view.View$PerformClick.run(View.java:18422)
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.os.Handler.handleCallback(Handler.java:733)
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.os.Handler.dispatchMessage(Handler.java:95)
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.os.Looper.loop(Looper.java:136)
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.app.ActivityThread.main(ActivityThread.java:5001)
07-10 11:29:59.423: E/AndroidRuntime(26313): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 11:29:59.423: E/AndroidRuntime(26313): at java.lang.reflect.Method.invoke(Method.java:515)
07-10 11:29:59.423: E/AndroidRuntime(26313): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
07-10 11:29:59.423: E/AndroidRuntime(26313): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
07-10 11:29:59.423: E/AndroidRuntime(26313): at dalvik.system.NativeStart.main(Native Method)
07-10 11:29:59.423: E/AndroidRuntime(26313): Caused by: java.lang.reflect.InvocationTargetException
07-10 11:29:59.423: E/AndroidRuntime(26313): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 11:29:59.423: E/AndroidRuntime(26313): at java.lang.reflect.Method.invoke(Method.java:515)
07-10 11:29:59.423: E/AndroidRuntime(26313): at android.view.View$1.onClick(View.java:3818)
07-10 11:29:59.423: E/AndroidRuntime(26313): ... 11 more
07-10 11:29:59.423: E/AndroidRuntime(26313): Caused by: java.lang.NullPointerException
07-10 11:29:59.423: E/AndroidRuntime(26313): at com.example.anotherdatabase.MainActivity.newPlayer(MainActivity.java:46)
07-10 11:29:59.423: E/AndroidRuntime(26313): ... 14 more
07-10 11:30:50.658: I/Adreno-EGL(27015): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
07-10 11:30:50.688: D/OpenGLRenderer(27015): Enabling debug mode 0
07-10 11:31:00.238: W/IInputConnectionWrapper(27015): showStatusIcon on inactive InputConnection
07-10 11:33:41.480: D/AndroidRuntime(28077): Shutting down VM
07-10 11:33:41.480: W/dalvikvm(28077): threadid=1: thread exiting with uncaught exception (group=0x4174bba8)
07-10 11:33:41.480: E/AndroidRuntime(28077): FATAL EXCEPTION: main
07-10 11:33:41.480: E/AndroidRuntime(28077): Process: com.example.anotherdatabase, PID: 28077
07-10 11:33:41.480: E/AndroidRuntime(28077): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.anotherdatabase/com.example.anotherdatabase.MainActivity}: java.lang.ClassCastException: android.widget.Button cannot be cast to android.widget.EditText
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.os.Handler.dispatchMessage(Handler.java:102)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.os.Looper.loop(Looper.java:136)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.ActivityThread.main(ActivityThread.java:5001)
07-10 11:33:41.480: E/AndroidRuntime(28077): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 11:33:41.480: E/AndroidRuntime(28077): at java.lang.reflect.Method.invoke(Method.java:515)
07-10 11:33:41.480: E/AndroidRuntime(28077): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
07-10 11:33:41.480: E/AndroidRuntime(28077): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
07-10 11:33:41.480: E/AndroidRuntime(28077): at dalvik.system.NativeStart.main(Native Method)
07-10 11:33:41.480: E/AndroidRuntime(28077): Caused by: java.lang.ClassCastException: android.widget.Button cannot be cast to android.widget.EditText
07-10 11:33:41.480: E/AndroidRuntime(28077): at com.example.anotherdatabase.MainActivity.onCreate(MainActivity.java:37)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.Activity.performCreate(Activity.java:5231)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-10 11:33:41.480: E/AndroidRuntime(28077): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
07-10 11:33:41.480: E/AndroidRuntime(28077): ... 11 more
07-10 11:33:43.442: I/Process(28077): Sending signal. PID: 28077 SIG: 9
07-10 11:36:58.490: I/Adreno-EGL(29284): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
07-10 11:36:58.531: D/OpenGLRenderer(29284): Enabling debug mode 0
07-10 11:37:03.906: W/IInputConnectionWrapper(29284): showStatusIcon on inactive InputConnection
07-10 11:38:13.851: I/Adreno-EGL(29892): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
07-10 11:38:13.881: D/OpenGLRenderer(29892): Enabling debug mode 0
07-10 11:38:29.908: D/AndroidRuntime(29892): Shutting down VM
07-10 11:38:29.908: W/dalvikvm(29892): threadid=1: thread exiting with uncaught exception (group=0x4174bba8)
07-10 11:38:29.908: E/AndroidRuntime(29892): FATAL EXCEPTION: main
07-10 11:38:29.908: E/AndroidRuntime(29892): Process: com.example.anotherdatabase, PID: 29892
07-10 11:38:29.908: E/AndroidRuntime(29892): java.lang.IllegalStateException: Could not execute method of the activity
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.view.View$1.onClick(View.java:3823)
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.view.View.performClick(View.java:4438)
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.view.View$PerformClick.run(View.java:18422)
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.os.Handler.handleCallback(Handler.java:733)
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.os.Handler.dispatchMessage(Handler.java:95)
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.os.Looper.loop(Looper.java:136)
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.app.ActivityThread.main(ActivityThread.java:5001)
07-10 11:38:29.908: E/AndroidRuntime(29892): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 11:38:29.908: E/AndroidRuntime(29892): at java.lang.reflect.Method.invoke(Method.java:515)
07-10 11:38:29.908: E/AndroidRuntime(29892): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
07-10 11:38:29.908: E/AndroidRuntime(29892): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
07-10 11:38:29.908: E/AndroidRuntime(29892): at dalvik.system.NativeStart.main(Native Method)
07-10 11:38:29.908: E/AndroidRuntime(29892): Caused by: java.lang.reflect.InvocationTargetException
07-10 11:38:29.908: E/AndroidRuntime(29892): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 11:38:29.908: E/AndroidRuntime(29892): at java.lang.reflect.Method.invoke(Method.java:515)
07-10 11:38:29.908: E/AndroidRuntime(29892): at android.view.View$1.onClick(View.java:3818)
07-10 11:38:29.908: E/AndroidRuntime(29892): ... 11 more
07-10 11:38:29.908: E/AndroidRuntime(29892): Caused by: java.lang.NumberFormatException: Invalid int: ""
07-10 11:38:29.908: E/AndroidRuntime(29892): at java.lang.Integer.invalidInt(Integer.java:137)
07-10 11:38:29.908: E/AndroidRuntime(29892): at java.lang.Integer.parseInt(Integer.java:358)
07-10 11:38:29.908: E/AndroidRuntime(29892): at java.lang.Integer.parseInt(Integer.java:331)
07-10 11:38:29.908: E/AndroidRuntime(29892): at com.example.anotherdatabase.MainActivity.newPlayer(MainActivity.java:47)
07-10 11:38:29.908: E/AndroidRuntime(29892): ... 14 more
07-10 11:29:59.423:D/AndroidRuntime（26313）：关闭虚拟机
07-10 11:29:59.423:W/dalvikvm（26313）：threadid=1：线程以未捕获异常退出（组=0x4174bba8）
07-10 11:29:59.423:E/AndroidRuntime（26313）：致命异常：main
07-10 11:29:59.423:E/AndroidRuntime（26313）：进程：com.example.anotherdatabase，PID:26313
07-10 11:29:59.423:E/AndroidRuntime（26313）：java.lang.IllegalStateException:无法执行活动的方法
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.view.view$1.onClick（view.java:3823）
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.view.view.performClick（view.java:4438）
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.view.view$PerformClick.run（view.java:18422）
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.os.Handler.handleCallback（Handler.java:733）上
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.os.Handler.dispatchMessage（Handler.java:95）上
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.os.Looper.loop（Looper.java:136）上
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.app.ActivityThread.main（ActivityThread.java:5001）上
07-10 11:29:59.423:E/AndroidRuntime（26313）：位于java.lang.reflect.Method.Invokenactive（本机方法）
07-10 11:29:59.423:E/AndroidRuntime（26313）：位于java.lang.reflect.Method.invoke（Method.java:515）
07-10 11:29:59.423:E/AndroidRuntime（26313）：在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:785）
07-10 11:29:59.423:E/AndroidRuntime（26313）：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:601）
07-10 11:29:59.423:E/AndroidRuntime（26313）：在dalvik.system.NativeStart.main（本机方法）
07-10 11:29:59.423:E/AndroidRuntime（26313）：由以下原因引起：java.lang.reflect.InvocationTargetException
07-10 11:29:59.423:E/AndroidRuntime（26313）：位于java.lang.reflect.Method.Invokenactive（本机方法）
07-10 11:29:59.423:E/AndroidRuntime（26313）：位于java.lang.reflect.Method.invoke（Method.java:515）
07-10 11:29:59.423:E/AndroidRuntime（26313）：在android.view.view$1.onClick（view.java:3818）
2007-10 11:29:59.423:E/AndroidRuntime（26313）：。。。还有11个
07-10 11:29:59.423:E/AndroidRuntime（26313）：由以下原因引起：java.lang.NullPointerException
07-10 11:29:59.423:E/AndroidRuntime（26313）：位于com.example.anotherdatabase.MainActivity.newPlayer（MainActivity.java:46）
2007-10 11:29:59.423:E/AndroidRuntime（26313）：。。。14多
07-10 11:30:50.658:I/Adreno EGL（27015）：EGL 1.4高通公司版本：I0404C4692AFB8623F95C43AEB6D5E13ED4B30DDB日期：2013年6月11日
07-10 11:30:50.688:D/OpenGLRenderer（27015）：启用调试模式0
07-10 11:31:00.238:W/IIInputConnectionWrapper（27015）：在非活动输入连接上显示状态图标
07-10 11:33:41.480:D/AndroidRuntime（28077）：关闭虚拟机
07-10 11:33:41.480:W/dalvikvm（28077）：threadid=1:线程退出时出现未捕获异常（组=0x4174bba8）
07-10 11:33:41.480:E/AndroidRuntime（28077）：致命异常：main
07-10 11:33:41.480:E/AndroidRuntime（28077）：进程：com.example.anotherdatabase，PID:28077
07-10 11:33:41.480:E/AndroidRuntime（28077）：java.lang.RuntimeException:无法启动活动ComponentInfo{com.example.anotherdatabase/com.example.anotherdatabase.MainActivity}:java.lang.ClassCastException:android.widget.Button无法强制转换为android.widget.EditText
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2184）
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2233）
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.app.ActivityThread.access$800（ActivityThread.java:135）
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1196）
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.os.Handler.dispatchMessage（Handler.java:102）上
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.os.Looper.loop（Looper.java:136）上
07-10 11:33:41.480:E/AndroidRuntime（28077）：位于android.app.ActivityThread.main（ActivityThread.java:5001）
07-10 11:33:41.480:E/AndroidRuntime（28077）：位于java.lang.reflect.Method.Invokenactive（本机方法）
07-10 11:33:41.480:E/AndroidRuntime（28077）：位于java.lang.reflect.Method.invoke（Method.java:515）
07-10 11:33:41.480:E/AndroidRuntime（28077）：在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:785）
07-10 11:33:41.480:E/AndroidRuntime（28077）：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:601）
07-10 11:33:41.480:E/AndroidRuntime（28077）：在dalvik.system.NativeStart.main（本机方法）
07-10 11:33:41.480:E/AndroidRuntime（28077）：原因：java.lang.ClassCastException:android.widget.Button无法转换为android.widget.EditText
07-10 11:33:41.480:E/AndroidRuntime（28077）：在com.example.anotherdatabase.MainActivity.onCreate（MainActivity.java:37）上
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.app.Activity.performCreate（Activity.java:5231）上
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1087）上
07-10 11:33:41.480:E/AndroidRuntime（28077）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2148）
07-10 11:33:41.480:E/Andr