Android 学习心得(8)——Activity的生命周期

偷来的图^_^

验证过程中定义了两个布局三个Activity重写了7个生命周期方法

代码如下

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.activitylife.MainActivity"
    tools:ignore="MergeRootFrame" >
    <Button android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="myclick"
        android:text="点我暂停"/>
        <Button android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="myclick2"
        android:text="点我停止"/>
</LinearLayout>

<RelativeLayout 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="com.example.activitylife.MainActivity$PlaceholderFragment" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

package com.example.activitylife;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {
    private static String TAG = "ActivityLife";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toast.makeText(getApplicationContext(), "onCreate", Toast.LENGTH_LONG).show();
        Log.i(TAG, "onCreate");
        
    }
    public void myclick(View v){
        startActivity(new Intent(this,otherActivity.class));
    }
    public void myclick2(View v){
        startActivity(new Intent(this,otherActivity2.class));
    }

    @Override
    protected void onDestroy() {
        Toast.makeText(getApplicationContext(), "onDestroy", Toast.LENGTH_LONG).show();
        Log.i(TAG, "onDestroy");
        super.onDestroy();
    }

    @Override
    protected void onPause() {
        Toast.makeText(getApplicationContext(), "onPause", Toast.LENGTH_LONG).show();
        Log.i(TAG, "onPause");
        super.onPause();
    }

    @Override
    protected void onResume() {
        Toast.makeText(getApplicationContext(), "onResume", Toast.LENGTH_LONG).show();
        Log.i(TAG, "onResume");
        super.onResume();
    }

    @Override
    protected void onStart() {
        Toast.makeText(getApplicationContext(), "onStart", Toast.LENGTH_LONG).show();
        Log.i(TAG, "onStart");
        super.onStart();
    }

    @Override
    protected void onStop() {
        Toast.makeText(getApplicationContext(), "onStop", Toast.LENGTH_LONG).show();
        Log.i(TAG, "onStop");
        super.onStop();
    }

    @Override
    protected void onRestart() {
        Toast.makeText(getApplicationContext(), "onRestart", Toast.LENGTH_LONG).show();
        Log.i(TAG, "onRestart");
        super.onRestart();
    }



}

package com.example.activitylife;

import android.app.Activity;
import android.os.Bundle;

public class otherActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
    }
}

package com.example.activitylife;

import android.app.Activity;
import android.os.Bundle;

public class otherActivity2 extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);
    }
}

运行结果如下

04-22 23:39:58.424: I/ActivityLife(2958): onCreate
04-22 23:39:58.454: I/ActivityLife(2958): onStart
04-22 23:39:58.474: I/ActivityLife(2958): onResume
04-22 23:40:12.114: I/ActivityLife(2958): onPause
04-22 23:40:16.614: I/ActivityLife(2958): onResume
04-22 23:40:19.414: I/ActivityLife(2958): onPause
04-22 23:40:22.264: I/ActivityLife(2958): onStop
04-22 23:40:30.964: I/ActivityLife(2958): onRestart
04-22 23:40:31.114: I/ActivityLife(2958): onStart
04-22 23:40:31.154: I/ActivityLife(2958): onResume
04-23 00:13:47.884: I/ActivityLife(2958): onPause
04-23 00:13:52.044: I/ActivityLife(2958): onStop