Android--->activity界面跳转，以及查看生命周期过程

main.xml界面布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/secondBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Second"
/>
<Button
android:id="@+id/thirdBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Third"
/>
</LinearLayout>

second.xml界面布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="SecondActivity"
/>
</LinearLayout>

third.xml界面布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="ThirdActivity"
/>
</LinearLayout>

第一个界面操作MainActivity.java

package com.szy.activity;

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;
import android.widget.Button;

public class MainActivity extends Activity
{
private final static String TAG="MainActivity";
private Button secondBtn=null;
private Button thirdBtn=null;

@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
secondBtn=(Button)findViewById(R.id.secondBtn);
thirdBtn=(Button)findViewById(R.id.thirdBtn);
secondBtn.setOnClickListener(listener);
thirdBtn.setOnClickListener(listener);
Log.i(TAG, "MainActivity-->onCreate");
}

@Override
protected void onDestroy()
{
super.onDestroy();
Log.i(TAG, "MainActivity-->onDestroy");
}

@Override
protected void onPause()
{
super.onPause();
Log.i(TAG, "MainActivity-->onPause");
try
{
Thread.sleep(2000);
} catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}

@Override
protected void onRestart()
{
super.onRestart();
Log.i(TAG, "MainActivity-->onRestart");
}

@Override
protected void onResume()
{
super.onResume();
Log.i(TAG, "MainActivity-->onResume");
}

@Override
protected void onStart()
{
super.onStart();
Log.i(TAG, "MainActivity-->onStart");
}

@Override
protected void onStop()
{
super.onStop();
Log.i(TAG, "MainActivity-->onStop");
}

private OnClickListener listener=new OnClickListener()
{

public void onClick(View v)
{
Button btn=(Button)v;
Intent intent=new Intent();
switch (btn.getId())
{
case R.id.secondBtn:
intent.setClass(MainActivity.this, SecondActivity.class);
break;
case R.id.thirdBtn:
intent.setClass(MainActivity.this, ThirdActivity.class);
break;
}
startActivity(intent);
}

};

}

第二个界面操作SecondActivity.java

package com.szy.activity;

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

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

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
Log.i(TAG, "SecondActivity-->onCreate");
}

@Override
protected void onDestroy()
{
super.onDestroy();
Log.i(TAG, "SecondActivity-->onDestroy");
}

@Override
protected void onPause()
{
super.onPause();
Log.i(TAG, "SecondActivity-->onPause");
}

@Override
protected void onRestart()
{
super.onRestart();
Log.i(TAG, "SecondActivity-->onRestart");
}

@Override
protected void onResume()
{
super.onResume();
Log.i(TAG, "SecondActivity-->onResume");
}

@Override
protected void onStart()
{
super.onStart();
Log.i(TAG, "SecondActivity-->onStart");
}

@Override
protected void onStop()
{
super.onStop();
Log.i(TAG, "SecondActivity-->onStop");
}
}

第三个界面操作ThirdActivity.java

package com.szy.activity;

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

public class ThirdActivity extends Activity
{
private static final String TAG = "MainActivity";

@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.third);
Log.i(TAG, "ThirdActivity-->onCreate");
}

@Override
protected void onDestroy()
{
super.onDestroy();
Log.i(TAG, "ThirdActivity-->onDestroy");
}

@Override
protected void onPause()
{
super.onPause();
Log.i(TAG, "ThirdActivity-->onPause");
}

@Override
protected void onRestart()
{
super.onRestart();
Log.i(TAG, "ThirdActivity-->onRestart");
}

@Override
protected void onResume()
{
super.onResume();
Log.i(TAG, "ThirdActivity-->onResume");
}

@Override
protected void onStart()
{
super.onStart();
Log.i(TAG, "ThirdActivity-->onStart");
}

@Override
protected void onStop()
{
super.onStop();
Log.i(TAG, "ThirdActivity-->onStop");
}
}

对三个界面activity注册一下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.szy.activity"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />

<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android: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>
<activity android:name=".SecondActivity"
android:label="@string/app_name">
</activity>
<activity android:name=".ThirdActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.Dialog">
</activity>
</application>
</manifest>