实验二——任务三——理解Task

任务3：理解Task

     

    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.运行效果图

核心代码

主活动MainActivity:

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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;
	@Override
	protected 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()
		{
			
			@Override
			public void onClick(View arg0)
			{
				// TODO Auto-generated method stub
				Intent intent = new Intent(MainActivity.this,SecondActivity.class);
				startActivity(intent);
			}
		});
		button2.setOnClickListener(new OnClickListener()
		{
			
			@Override
			public void onClick(View arg0)
			{
				// TODO Auto-generated method stub
				Intent intent1=new Intent(Intent.ACTION_DIAL);
				intent1.setData(Uri.parse("tel:10086"));
				startActivity(intent1);
			}
		});
	}

	@Override
	public 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;
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_second);
		button = (Button) findViewById(R.id.but2_no1);
		button.setOnClickListener(new OnClickListener()
		{
			
			@Override
			public void onClick(View arg0)
			{
				// TODO Auto-generated method stub
				Intent intent = new Intent(SecondActivity.this,MainActivity.class);
				startActivity(intent);
			}
		});
	}

	@Override
	public 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>