实验二——任务三——理解Task

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任务3:理解Task

     

    app1activity1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app1activity1,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.运行效果图




核心代码


主活动MainActivity:

package com.example.thirdlab;import android.net.Uri;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity{    private Button button1;    private Button button2;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button1 = (Button)findViewById(R.id.but_no1);button2 = (Button)findViewById(R.id.but_no2);button1.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0){// TODO Auto-generated method stubIntent intent = new Intent(MainActivity.this,SecondActivity.class);startActivity(intent);}});button2.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0){// TODO Auto-generated method stubIntent intent1=new Intent(Intent.ACTION_DIAL);intent1.setData(Uri.parse("tel:10086"));startActivity(intent1);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu){// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}


主活动布局:

<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/but_no1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/text_but1"        />    <Button         android:id="@+id/but_no2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/but_no1"        android:text="@string/text_but2"        />              </RelativeLayout>

第二个活动:

package com.example.thirdlab;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class SecondActivity extends Activity{ private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);button = (Button) findViewById(R.id.but2_no1);button.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View arg0){// TODO Auto-generated method stubIntent intent = new Intent(SecondActivity.this,MainActivity.class);startActivity(intent);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu){// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.second, menu);return true;}}

第二个布局:

<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" >    <Button         android:id="@+id/but2_no1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/text_but3"        /></RelativeLayout>


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