安卓学习笔记（一）、使用application传递数据

最新推荐文章于 2021-05-26 02:42:30 发布

原创最新推荐文章于 2021-05-26 02:42:30 发布 · 624 阅读

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#Android #数据 #application #数据传递

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本文深入探讨了Android应用开发中的对象继承与多态概念，通过实例展示了如何在实际项目中运用这些高级特性来提高代码的复用性和可维护性。

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() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				myApp = (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;
	}
	
	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		setName("张三");
	}
	
}

public class OtherActivity extends Activity {
	private MyApp myApp;
	private TextView textView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.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>