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Android 应用程序停止，sqlite不工作

android sqlite

Android 应用程序停止，sqlite不工作,android,sqlite,Android,Sqlite,我的应用程序意外停止。这是我的密码 package com.nisani.angel; //import info.androidhive.jsonparsing.MainActivity.GetContacts; import android.app.Activity; import android.content.Intent; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQL

我的应用程序意外停止。这是我的密码

package com.nisani.angel;

//import info.androidhive.jsonparsing.MainActivity.GetContacts;
import android.app.Activity;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.os.Bundle;
import android.util.Log; 
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
 import android.widget.EditText;
import android.widget.ShareActionProvider;
import android.widget.Toast;

public class MainActivity extends Activity {
EditText edit_name;
EditText edit_phone;
Button add_new=(Button)findViewById(R.id.button1);
SQLiteDatabase db=null;
String tag=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Log.i(tag, "1");
    try{

       db= openOrCreateDatabase("Mydb", MODE_PRIVATE, null);
       db.execSQL("create table if not exists myname(name varchar,mobile_no varchar)");

    }

    catch(NullPointerException e){

        Log.i(tag, "2");
    }
add_new.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View arg0) {
        edit_phone=(EditText)findViewById(R.id.phone);
        edit_name=(EditText)findViewById(R.id.name);
        String name1=edit_name.getText().toString();
        String mobile_no1=edit_phone.getText().toString();
        db.execSQL("insert into myname values('"+name1+"','"+mobile_no1+"')");
        db.close();

    }
});

Toast.makeText(this, "values inserted successfully.", Toast.LENGTH_LONG).show();
}

}

这是我的原木猫

 07-09 13:22:54.010: D/AndroidRuntime(2251): Shutting down VM
 07-09 13:22:54.010: W/dalvikvm(2251): threadid=1: thread exiting with     uncaught           exception (group=0xb2a96ba8)
 07-09 13:22:54.060: E/AndroidRuntime(2251): FATAL EXCEPTION: main
07-09 13:22:54.060: E/AndroidRuntime(2251): Process: com.nisani.angel, PID: 2251
07-09 13:22:54.060: E/AndroidRuntime(2251): java.lang.RuntimeException: Unable to     instantiate activity ComponentInfo{com.nisani.angel/com.nisani.angel.MainActivity}: java.lang.NullPointerException
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.os.Handler.dispatchMessage(Handler.java:102)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.os.Looper.loop(Looper.java:136)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.ActivityThread.main(ActivityThread.java:5017)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at java.lang.reflect.Method.invokeNative(Native Method)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at java.lang.reflect.Method.invoke(Method.java:515)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at dalvik.system.NativeStart.main(Native Method)
07-09 13:22:54.060: E/AndroidRuntime(2251): Caused by: java.lang.NullPointerException
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.Activity.findViewById(Activity.java:1884)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at com.nisani.angel.MainActivity.<init>(MainActivity.java:21)
 07-09 13:22:54.060: E/AndroidRuntime(2251):    at     java.lang.Class.newInstanceImpl(Native Method)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at     java.lang.Class.newInstance(Class.java:1208)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
07-09 13:22:54.060: E/AndroidRuntime(2251):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)
07-09 13:22:54.060: E/AndroidRuntime(2251):     ... 11 more
07-09 13:23:02.440: I/Process(2251): Sending signal. PID: 2251 SIG: 9

07-09 13:22:54.010:D/AndroidRuntime（2251）：关闭虚拟机
07-09 13:22:54.010:W/dalvikvm（2251）：线程ID=1：线程退出，但出现未捕获异常（组=0xb2a96ba8）
07-09 13:22:54.060:E/AndroidRuntime（2251）：致命异常：主
07-09 13:22:54.060:E/AndroidRuntime（2251）：进程：com.nisani.angle，PID:2251
07-09 13:22:54.060:E/AndroidRuntime（2251）：java.lang.RuntimeException:无法实例化活动组件信息{com.nisani.angle/com.nisani.angle.MainActivity}:java.lang.NullPointerException
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2121）上
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2245）
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.app.ActivityThread.access$800（ActivityThread.java:135）
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1196）
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.os.Handler.dispatchMessage（Handler.java:102）上
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.os.Looper.loop（Looper.java:136）上
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于android.app.ActivityThread.main（ActivityThread.java:5017）
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于java.lang.reflect.Method.Invokenactive（本机方法）
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于java.lang.reflect.Method.invoke（Method.java:515）
07-09 13:22:54.060:E/AndroidRuntime（2251）：在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:779）
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595）
07-09 13:22:54.060:E/AndroidRuntime（2251）：在dalvik.system.NativeStart.main（本机方法）
07-09 13:22:54.060:E/AndroidRuntime（2251）：由以下原因引起：java.lang.NullPointerException
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.app.Activity.findViewById（Activity.java:1884）上
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于com.nisani.angle.MainActivity。（MainActivity.java:21）
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于java.lang.Class.newInstanceImpl（本机方法）
07-09 13:22:54.060:E/AndroidRuntime（2251）：位于java.lang.Class.newInstance（Class.java:1208）
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.app.Instrumentation.newActivity（Instrumentation.java:1061）上
07-09 13:22:54.060:E/AndroidRuntime（2251）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2112）上
2007-09 13:22:54.060:E/AndroidRuntime（2251）：。。。还有11个
07-09 13:23:02.440:I/进程（2251）：发送信号。PID:2251信号：9
它不起作用。如何纠正它。请尽快回复。 它不起作用。如何纠正它。请尽快回复。 它不起作用。如何纠正它。请尽快回复。

 Button add_new=(Button)findViewById(R.id.button1);
必须在
setContentView（R.layout.activity_main）之后的
onCreate

查看来源@

这个

必须在
setContentView（R.layout.activity_main）之后的
onCreate

查看来源@

这个

必须在
setContentView（R.layout.activity_main）之后的
onCreate

查看来源@

这个

必须在
setContentView（R.layout.activity_main）之后的
onCreate

查看来源@

设置如下：


public class MainActivity extends Activity {
 EditText edit_name;
 EditText edit_phone;
 Button add_new;
 SQLiteDatabase db=null;
 String tag=null;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  add_new=(Button)findViewById(R.id.button1);     // Add here
  Log.i(tag, "1");
  try{

   db= openOrCreateDatabase("Mydb", MODE_PRIVATE, null);
   db.execSQL("create table if not exists myname(name varchar,mobile_no varchar)");

  }

  catch(NullPointerException e){

    Log.i(tag, "2");
  }
 add_new.setOnClickListener(new View.OnClickListener() {

 @Override
 public void onClick(View arg0) {
    edit_phone=(EditText)findViewById(R.id.phone);
    edit_name=(EditText)findViewById(R.id.name);
    String name1=edit_name.getText().toString();
    String mobile_no1=edit_phone.getText().toString();
    db.execSQL("insert into myname values('"+name1+"','"+mobile_no1+"')");
    db.close();

 }
});


设置如下：


public class MainActivity extends Activity {
 EditText edit_name;
 EditText edit_phone;
 Button add_new;
 SQLiteDatabase db=null;
 String tag=null;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  add_new=(Button)findViewById(R.id.button1);     // Add here
  Log.i(tag, "1");
  try{

   db= openOrCreateDatabase("Mydb", MODE_PRIVATE, null);
   db.execSQL("create table if not exists myname(name varchar,mobile_no varchar)");

  }

  catch(NullPointerException e){

    Log.i(tag, "2");
  }
 add_new.setOnClickListener(new View.OnClickListener() {

 @Override
 public void onClick(View arg0) {
    edit_phone=(EditText)findViewById(R.id.phone);
    edit_name=(EditText)findViewById(R.id.name);
    String name1=edit_name.getText().toString();
    String mobile_no1=edit_phone.getText().toString();
    db.execSQL("insert into myname values('"+name1+"','"+mobile_no1+"')");
    db.close();

 }
});


设置如下：


public class MainActivity extends Activity {
 EditText edit_name;
 EditText edit_phone;
 Button add_new;
 SQLiteDatabase db=null;
 String tag=null;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  add_new=(Button)findViewById(R.id.button1);     // Add here
  Log.i(tag, "1");
  try{

   db= openOrCreateDatabase("Mydb", MODE_PRIVATE, null);
   db.execSQL("create table if not exists myname(name varchar,mobile_no varchar)");

  }

  catch(NullPointerException e){

    Log.i(tag, "2");
  }
 add_new.setOnClickListener(new View.OnClickListener() {

 @Override
 public void onClick(View arg0) {
    edit_phone=(EditText)findViewById(R.id.phone);
    edit_name=(EditText)findViewById(R.id.name);
    String name1=edit_name.getText().toString();
    String mobile_no1=edit_phone.getText().toString();
    db.execSQL("insert into myname values('"+name1+"','"+mobile_no1+"')");
    db.close();

 }
});


设置如下：


public class MainActivity extends Activity {
 EditText edit_name;
 EditText edit_phone;
 Button add_new;
 SQLiteDatabase db=null;
 String tag=null;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  add_new=(Button)findViewById(R.id.button1);     // Add here
  Log.i(tag, "1");
  try{

   db= openOrCreateDatabase("Mydb", MODE_PRIVATE, null);
   db.execSQL("create table if not exists myname(name varchar,mobile_no varchar)");

  }

  catch(NullPointerException e){

    Log.i(tag, "2");
  }
 add_new.setOnClickListener(new View.OnClickListener() {

 @Override
 public void onClick(View arg0) {
    edit_phone=(EditText)findViewById(R.id.phone);
    edit_name=(EditText)findViewById(R.id.name);
    String name1=edit_name.getText().toString();
    String mobile_no1=edit_phone.getText().toString();
    db.execSQL("insert into myname values('"+name1+"','"+mobile_no1+"')");
    db.close();

 }
});


因为您是stackoverflow新手而阅读因为您是stackoverflow新手而阅读因为您是stackoverflow新手而阅读