运行效果图


app1的activity1有两个按钮,一个按钮跳转到Activity2,另外一个按钮跳转到打电话的页面,打电话这个功能不属于app1,我们假设它为app2。
首先默认进入app1的activity1,点击button1后跳转到activity2,再点击activity2的按钮后跳转到activity1,再点击button2跳转到打电话页面,最后依次点返回按钮,大家看Task栈效果。
1. 训练目标
理解Task的含义
主要代码:
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package cn.bzu.taskdemo;
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import android.net.Uri;
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import android.os.Bundle;
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import android.app.Activity;
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import android.content.Intent;
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import android.view.Menu;
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import android.view.View;
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public class MainActivity extends Activity
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{
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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}
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public void toSecond(View view){
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Intent intent = new Intent();
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intent.setClass(this, SecondActivity.class);
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startActivity(intent);
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}
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public void dial(View view){
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Intent intent=new Intent();
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intent.setAction(Intent.ACTION_CALL);
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intent.setData(Uri.parse("tel://5556"));
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startActivity(intent);
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}
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}
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package cn.bzu.taskdemo;
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import android.app.Activity;
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import android.content.Intent;
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import android.os.Bundle;
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import android.view.View;
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public class SecondActivity extends Activity
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{
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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// TODO Auto-generated method stub
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_second);
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}
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public void toFirst(View view){
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Intent intent=new Intent();
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intent.setClass(this, MainActivity.class);
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startActivity(intent);
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}
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}
Task是一个栈,特点:后进先出