1.AndroidManifast.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.tt"android:versionCode="1"android:versionName="1.0" ><uses-sdkandroid:minSdkVersion="8"android:targetSdkVersion="21" /><applicationandroid:name=".ASD"android:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid: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><activityandroid:name=".MainActivity2"android:label="@string/app_name" ></activity></application></manifest>
2.layout幾乎未修改（textView加了個id）

3.java

package com.example.tt;import android.app.Activity; import android.app.Application; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem;public class ASD extends Application {int i ;@Overridepublic void onCreate() { //必須要復寫，在所以的Activity創建前創建// TODO Auto-generated method stubsuper.onCreate();i = 10;} }
package com.example.tt;import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.TextView;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//這里要重點注意（application在整個程序中都使用這種獲取，以保證是單例模式，優化性能）ASD asd = (ASD) getApplication();TextView textView = (TextView) findViewById(R.id.tv);textView.setText(""+asd.i);asd.i = 12333;textView.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent(MainActivity.this,MainActivity2.class);startActivity(intent);}});} }
package com.example.tt;import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.TextView;public class MainActivity2 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ASD asd = (ASD) getApplication();TextView textView = (TextView) findViewById(R.id.tv);textView.setText(""+asd.i);} }

總結

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