Activity的生命周期 二

这篇文章我们要看一下Task以及对话框风格的Activity

package com.example.helloworld;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
 * 1 Task的基本概念
 * 2 Activity和Task之间的关系
 * 3 对话框风格的Activity的使用方法，要实现这一的一个Activity，只需要在注册Activity的时候注明他就可以了
 *         调用这样的一个Activity，原来调用的Activity不会调用onStop()方法
 * Task 任务（栈，遵循后进先出的原则,他可以帮我们把不同应用 程序里面的Activity组织在一起）
 * @author David
 *
 */
public class FiveLessonDemo1 extends Activity{
    private Button button=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fiveone);
        button=(Button)findViewById(R.id.calculate);
        button.setText("按钮1");
        button.setOnClickListener(new ButtonListener());
    }
    
    
    class ButtonListener implements OnClickListener{

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Intent intent=new Intent();
            intent.setClass(FiveLessonDemo1.this, FiveLessonDemo4.class);
            //    intent.setClass(FiveLessonDemo1.this, FiveLessonDemo2.class);
            startActivity(intent);
        }
        
        
    }
}

package com.example.helloworld;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FiveLessonDemo2 extends Activity{
    private Button button=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fivetwo);
        button=(Button)findViewById(R.id.calculate);
        button.setText("按钮2");
        button.setOnClickListener(new ButtonListener());
    }
    
    
    class ButtonListener implements OnClickListener{

        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent intent=new Intent();
            intent.setClass(FiveLessonDemo2.this, FiveLessonDemo3.class);
            startActivity(intent);
            finish();//如果调用这个方法，那么这个Activity将被销毁，将被从堆栈中删除
        }
        
        
    }
}

package com.example.helloworld;

import com.example.helloworld.FiveLessonDemo2.ButtonListener;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FiveLessonDemo3 extends Activity{
    private Button button=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fivethree);
        button=(Button)findViewById(R.id.calculate);
        button.setText("按钮3");
        button.setOnClickListener(new ButtonListener());
    }

    class ButtonListener implements OnClickListener{

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Uri uri=Uri.parse("smsto://0800000123");
            Intent intent=new Intent(Intent.ACTION_SENDTO,uri);
            intent.putExtra("sms_body", "今天天气真好");
            startActivity(intent);
        }
        
        
    }
}

package com.example.helloworld;

import com.example.helloworld.FiveLessonDemo2.ButtonListener;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FiveLessonDemo4 extends Activity{
    private Button button=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fivefour);
        button=(Button)findViewById(R.id.calculate);
        button.setText("确定");
        button.setOnClickListener(new ButtonListener());
    }
    
    class ButtonListener implements OnClickListener{

        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            finish();
        }
        
        
    }
}

这里我们省略了样式文件，因为他们本身都比较简单，和以前一样，仅仅有一个BUTTON而已

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.helloworld"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="4"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
        </activity>
        <activity
            android:name=".SecondLessonDemo1"
            android:label="@string/other" >
        </activity>
        <activity
            android:name=".SecondLessonDemo2"
            android:label="dd" >
        </activity>
        <activity
            android:name=".ThridLessonDemo1"
            android:label="dd2" >
        </activity>
        <activity
            android:name=".ThridLessonDemo2"
            android:label="dd3" >
        </activity>
        <activity
            android:name=".FourLessonDemo1"
            android:label="dd" >
        </activity>
        <activity
            android:name=".FourLessonDemo2"
            android:label="dd" >
        </activity>
         <activity
            android:name=".FiveLessonDemo1"
            android:label="dd" >
              <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
         <activity
            android:name=".FiveLessonDemo2"
            android:label="dd" >
        </activity>
         <activity
            android:name=".FiveLessonDemo3"
            android:label="dd" >
        </activity>
         <activity
            android:name=".FiveLessonDemo4"
            android:label="dd"
            android:theme="@android:style/Theme.Dialog" >
        </activity>
    </application>

</manifest>