安卓学习笔记（一）、使用application传递数据

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public class MainActivity extends Activity {public Button button;private MyApp myApp;@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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubmyApp = (MyApp) getApplication();myApp.setName("jack");Intent intent = new Intent(MainActivity.this,OtherActivity.class);startActivity(intent);}});    }

public class MyApp extends Application {public String name;public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();setName("张三");}}

public class OtherActivity extends Activity {private MyApp myApp;private TextView textView;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.other);textView = (TextView) this.findViewById(R.id.msg);myApp = (MyApp) getApplication();textView.setText("--appname-->>"+myApp.getName());}}

<application        android:name=".MyApp"        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".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=".OtherActivity">        </activity>    </application>

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