Activity生命周期的运行流程

Activity的生命周期运行流程：

·当Activity第1次被启动：

·onCreate()->onStart()->onResume()

·当Activity被遮挡后再次显示：

·onRestart->onStart()->onResume()

·当Activity被遮挡：

·onPause()->onStop（）

·当点击返回（Back）键：

·onPause()->onStop()->onDestroy()

详细请參看測试案例：

创建三个Activity

MainActivity

SecondActivity

SmallActivity（小号的Activity。在激活的时候仅仅会遮挡上一个Activity的一部分。即:上一个Activity不会全然被

smallActivity遮挡，所以这样的情况上一个Activity不会onStop()）

SmallActivity创建的时候要做特殊调整

在配置文件里调整ctivity的主题为：

android:theme="@android:style/Theme.Translucent.NoTitleBar"

在布局文件里调整

把根节点调整大小为以下的大小，

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="200dp"

android:layout_height="200dp"

android:background="#207044"

tools:context=".SmallActivity" >

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="SmallActivity"

android:textSize="30sp" />

</RelativeLayout>

MainActivity：

package com.example.activity_test;

import android.location.GpsStatus.Listener;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity {
private final String TAG = "Activity LifeCycle";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "MainActivity -> onCreate()");
InnerOnClickListener listener = new InnerOnClickListener();
findViewById(R.id.btn_SecondActivity).setOnClickListener(listener);
findViewById(R.id.btn_Small).setOnClickListener(listener);

}

private class InnerOnClickListener implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn_SecondActivity:
startActivity(new Intent(getApplicationContext(),SecondActivity.class));

break;
case R.id.btn_Small:
startActivity(new Intent(getApplicationContext(),SmallActivity.class));
break;

default:
break;
}

}

}

@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.d(TAG, "MainActivity -> onStart()");
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.d(TAG, "MainActivity -> onResume()");
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.d(TAG, "MainActivity -> onRestart()");
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.d(TAG, "MainActivity -> onPause()");
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.d(TAG, "MainActivity -> onStop()");
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.d(TAG, "MainActivity -> onDestroy()");
}

}

SecondActivity:

package com.example.activity_test;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;

public class SecondActivity extends Activity {
private final String TAG = "Activity LifeCycle";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Log.e(TAG, "SecondActivity -> onCreate()");
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.e(TAG, "SecondActivity -> onStart()");
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.e(TAG, "SecondActivity -> onResume()");
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.e(TAG, "SecondActivity -> onRestart()");
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.e(TAG, "SecondActivity -> onPause()");
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.e(TAG, "SecondActivity -> onStop()");
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.e(TAG, "SecondActivity -> onDestroy()");
}
}

SmallActivity:

package com.example.activity_test;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;

public class SmallActivity extends Activity {
private final String TAG = "Activity LifeCycle";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_small);
Log.i(TAG, "SmallActivity -> onCreate()");
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.i(TAG, "SmallActivity -> onStart()");
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.i(TAG, "SmallActivity -> onResume()");
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.i(TAG, "SmallActivity -> onRestart() ");
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.i(TAG, "SmallActivity -> onPause()");
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.i(TAG, "SmallActivity ->  onStop()");
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.i(TAG, "SmallActivity -> onDestroy()");
}
}