Android 通过bundle传递值并在另一个活动中获取
一切似乎都正常,直到我启动并决定输入我的名字并按下按钮开始游戏时,似乎没有将值传递到其他活动中,有人能帮我解决这个问题吗,请在eclipse luna上执行此操作 主要活动:Android 通过bundle传递值并在另一个活动中获取,android,eclipse,bundles,Android,Eclipse,Bundles,一切似乎都正常,直到我启动并决定输入我的名字并按下按钮开始游戏时,似乎没有将值传递到其他活动中,有人能帮我解决这个问题吗,请在eclipse luna上执行此操作 主要活动: public class MainActivity extends Activity { private Button GameButton; private EditText TextBox; private String UserName; @Override protecte
public class MainActivity extends Activity {
private Button GameButton;
private EditText TextBox;
private String UserName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextBox = (EditText)findViewById(R.id.enterName);
GameButton = (Button)findViewById(R.id.gameStart);
GameButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
UserName = TextBox.getText().toString();
Intent g = new Intent(getBaseContext(),GameActivity.class);
g.putExtra(GameActivity.PlayerName, UserName);
startActivity(g);
}
});
}
@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);
}
}
游戏活动:
package com.example.battleships;
public class GameActivity extends Activity {
private ImageView mMyImage1, mMyImage2, mMyImage3, mMyImage4, mMyImage5,
mMyImage6, mMyImage7, mMyImage8, mMyImage9, mMyImage10, mMyImage11,
mMyImage12, mMyImage13, mMyImage14, mMyImage15, mMyImage16,
mMyImage17, mMyImage18, mMyImage19, mMyImage20, mMyImage21,
mMyImage22, mMyImage23, mMyImage24, mMyImage25;
public static final String PlayerName = "com.example.battleships.Name";
public ImageView[] mYimage = { mMyImage1, mMyImage2, mMyImage3, mMyImage4,
mMyImage5, mMyImage6, mMyImage7, mMyImage8, mMyImage9, mMyImage10,
mMyImage11, mMyImage12, mMyImage13, mMyImage14, mMyImage15,
mMyImage16, mMyImage17, mMyImage18, mMyImage19, mMyImage20,
mMyImage21, mMyImage22, mMyImage23, mMyImage24, mMyImage25 };
private int[] nums = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1 };
private int myCount = 0, Count = 8;
private String GamerName;
private TextView myText;
private Drawable bomb, clown;
Drawable startImage;
@Override
// Method
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
GamerName = getIntent().getStringExtra(PlayerName);
myText = (TextView)findViewById(R.id.textView1);
myText.setText("Hi, " + GamerName + "! You have" + Count + "attempts.");
//..........
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.battleships.GameActivity"
tools:ignore="UselessParent" >
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="23dp"
android:columnCount="5"
android:rowCount="5"
>
<ImageView
android:id="@+id/ImageView1"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView3"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView4"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc"/>
<ImageView
android:id="@+id/imageView5"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView6"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView7"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView8"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView9"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView10"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView11"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView12"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView13"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView14"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView15"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView16"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView17"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView18"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView19"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView20"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView21"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView22"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView23"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView24"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView25"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
</GridLayout>
</RelativeLayout>
以下是GameActivity的布局xml:
package com.example.battleships;
public class GameActivity extends Activity {
private ImageView mMyImage1, mMyImage2, mMyImage3, mMyImage4, mMyImage5,
mMyImage6, mMyImage7, mMyImage8, mMyImage9, mMyImage10, mMyImage11,
mMyImage12, mMyImage13, mMyImage14, mMyImage15, mMyImage16,
mMyImage17, mMyImage18, mMyImage19, mMyImage20, mMyImage21,
mMyImage22, mMyImage23, mMyImage24, mMyImage25;
public static final String PlayerName = "com.example.battleships.Name";
public ImageView[] mYimage = { mMyImage1, mMyImage2, mMyImage3, mMyImage4,
mMyImage5, mMyImage6, mMyImage7, mMyImage8, mMyImage9, mMyImage10,
mMyImage11, mMyImage12, mMyImage13, mMyImage14, mMyImage15,
mMyImage16, mMyImage17, mMyImage18, mMyImage19, mMyImage20,
mMyImage21, mMyImage22, mMyImage23, mMyImage24, mMyImage25 };
private int[] nums = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1 };
private int myCount = 0, Count = 8;
private String GamerName;
private TextView myText;
private Drawable bomb, clown;
Drawable startImage;
@Override
// Method
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
GamerName = getIntent().getStringExtra(PlayerName);
myText = (TextView)findViewById(R.id.textView1);
myText.setText("Hi, " + GamerName + "! You have" + Count + "attempts.");
//..........
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.battleships.GameActivity"
tools:ignore="UselessParent" >
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="23dp"
android:columnCount="5"
android:rowCount="5"
>
<ImageView
android:id="@+id/ImageView1"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView3"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView4"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc"/>
<ImageView
android:id="@+id/imageView5"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="0"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView6"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView7"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView8"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView9"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView10"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="1"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView11"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView12"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView13"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView14"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView15"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="2"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView16"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView17"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView18"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView19"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView20"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="3"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView21"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="0"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView22"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="1"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView23"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="2"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView24"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="3"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
<ImageView
android:id="@+id/imageView25"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_column="4"
android:layout_gravity="start|top"
android:layout_row="4"
android:onClick="action"
android:contentDescription="@string/desc" />
</GridLayout>
</RelativeLayout>
re您可以使用
SharedReferences
来执行此操作。使用SharedReferences
是在整个类中存储和检索原语或字符串并使它们在会话之间保持的一种简单方法
要使用它们,您需要创建一个SharedReferences.Editor
(用于添加值)或一个SharedReferences
对象(用于检索值)。这些对象的import
语句为:
import android.content.SharedPreferences;
或
要设置值,请使用以下代码:
SharedPreferences.Editor editor = getSharedPreferences("preferences (or whatever you want)", MODE_PRIVATE).edit();
editor.putString("username", UserName);
editor.commit();
要从任何其他类检索值,请执行以下操作:
SharedPreferences preferences = getSharedPreferences("preferences (or whatever you want)", MODE_PRIVATE);
GamerName = preferences.getString("username", "Value to put in case there is an error");
如果您不想在会话之间保留这些值,只需将这段代码放在main活动中的onCreate
方法中:
SharedPreferences.Editor resetter = getSharedPreferences("preferences (or whatever you want)", MODE_PRIVATE);
resetter.remove("username");
resetter.commit();
看起来您刚刚忘记将textView1
放在activity\u game.xml
文件中
只需将TextView
添加到xml文件中,就可以消除您得到的NullPointerException
将文本视图
置于网格视图
之外:
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="23dp"
android:columnCount="5"
android:rowCount="5"
>
这就是我遇到的错误。谢谢你的帮助。非常感谢你,该死的,我都没注意到。