Android Api Demos登顶之路（六）

本例验证的是finishiAffinity()方法，正如demo中介绍的那样No matter how deep you go,Activity.finishAffinity() will get you back，无论你走多远，它都能把你带

回来。

finishiAffinity()方法，可以关闭当前activity所属的activity栈中所有的activity。如果所有activity都保存在默认栈中，则使用该方法会直接退出程序。

本例是通过不断调用自身，向栈中添加任意的activity，尔后通过调用finishiAffinity()方法结束掉所有的activity。

布局文件activity_finish_affinity.xml,这里没有什么难理解的，也就设置了一个文字的外观样式。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="5dp" >

    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="No matter how deep you go,Activity.finishAffinity() will get you back"/>
    <TextView 
        android:id="@+id/tv_finish_nest"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingTop="5dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Current nesting:1"/>

    <Button
        android:id="@+id/bt_finish_nest"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        android:text="nest some more" />

    <Button
        android:id="@+id/bt_finish_finish"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Finish!" />

</LinearLayout>
           

新建FinishAffinityActivity类

public class FinishAffinityActivity extends Activity {
    private TextView tv_nest;
    private Button bt_nest,bt_finish; 
    private int nesting;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_finish_affinity);
        tv_nest=(TextView) findViewById(R.id.tv_finish_nest);
        bt_nest=(Button) findViewById(R.id.bt_finish_nest);
        bt_finish=(Button) findViewById(R.id.bt_finish_finish);
        nesting=getIntent().getIntExtra("current_nesting", );
        tv_nest.setText("Current nesting:"+nesting);

        bt_nest.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // 通过不断调用自身向栈中添加activity
                Intent intent = new Intent(FinishAffinityActivity.this, FinishAffinityActivity.class);
                intent.putExtra("current_nesting", nesting+);
                startActivity(intent);
            }
        });
        bt_finish.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                finishAffinity();
            }
        });
    }
}
           

别忘记在配置文件中配置activity噢！