實例：

1、layout的代碼

　　activity_main.xml　　　　

<LinearLayout 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=".MainActivity" >

<Button
android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="使用application傳遞數據" />

</LinearLayout>

　　activity_other.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:id="@+id/msg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="TextView" />

</LinearLayout>

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2、src下的代碼

　　MainActivity.java

public class MainActivity extends Activity {
private Button button;
private MyApplication myApplication;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button=(Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
myApplication=(MyApplication)getApplication();
myApplication.setName("李四");
Intent intent=new Intent(MainActivity.this,OtherActivity.class);//意圖
startActivity(intent);//啟動意圖
}
});
}

@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;
}

}

　　OtherActivity.java

public class OtherActivity extends Activity {
private MyApplication myApplication;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_other);
textView=(TextView) this.findViewById(R.id.msg);
myApplication=(MyApplication) getApplication();
textView.setText("myApplication--->"+myApplication.getName());
}
}

　　MyApplication.java

public class MyApplication extends Application{
private String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
@Override
public void onCreate() {
super.onCreate();
this.setName("張三");
}
}

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3、AndroidManifest.xml

　　

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jc.application"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />

<application
android:name="com.jc.application.MyApplication"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.jc.application.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.jc.application.OtherActivity">

</activity>
</application>

</manifest>

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轉載于:https://www.cnblogs.com/RocketMan/p/5328910.html

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