android之activities的生命周期

生命周期图片：

测试主页面布局:

：layout/activity_main.xml

<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=".MainActivity" >


    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动SecondActivity" />


</RelativeLayout>

测试主页面java代码：

package com.sxt.day04_03;


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


public class MainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.i("main","onCreate()");
setListener();
}


private void setListener() {
findViewById(R.id.button).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent);
}
});
}


@Override
protected void onStart() {
super.onStart();
Log.i("main","onStart()");
}

@Override
protected void onResume() {
super.onResume();
Log.i("main","onResume()");
}

@Override
protected void onPause() {
super.onPause();
Log.i("main", "onPause()");
}

@Override
protected void onStop() {
super.onStop();
Log.i("main","onStop()");
}

@Override
protected void onDestroy() {
super.onDestroy();
Log.i("main","onDestroy()");
}

@Override
protected void onRestart() {
super.onRestart();
Log.i("main","onRestatr()");
}
}

第二个次页面布局：

：layout/activity_second.xml

<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=".SecondActivity" >


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


</RelativeLayout>

第二个次页面java代码：

package com.sxt.day04_03;


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


public class SecondActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
}


}

效果：