Android四种启动模式

最新推荐文章于 2022-11-05 22:35:33 发布

原创最新推荐文章于 2022-11-05 22:35:33 发布 · 281 阅读

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CC 4.0 BY-SA版权

文章标签：

#android

本文介绍了一个简单的Android应用程序，该程序包含三个活动页面：MainActivity、Main2Activity 和 Main3Activity，并通过按钮点击实现页面间的跳转。文章展示了如何使用Intent进行页面跳转及日志打印任务ID的方法。

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运行结果图：

以下为源代码：

mainfest
```<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.edu.bzu.alm">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Main2Activity" android:launchMode="singleTask"></activity>
        <activity android:name=".Main3Activity" ></activity>
    </application>

</manifest>





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activity_main.xml

"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    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="cn.edu.bzu.alm.MainActivity">


    <Button
        android:text="第一个页面"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="click1"
        android:id="@+id/click1" />

</RelativeLayout>





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activity_main2.xml

"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    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="cn.edu.bzu.alm.MainActivity">


    <Button
        android:text="第一个页面"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="click1"
        android:id="@+id/click1" />

</RelativeLayout>





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activity_main3.xml

"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main3"
    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="cn.edu.bzu.alm.Main3Activity">

    <Button
        android:text="第三个页面"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/click2"
        android:layout_marginTop="10dp"
        android:id="@+id/click3" />

</RelativeLayout>





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MainActivity.java


import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    private Button click1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        click1=(Button)findViewById(R.id.click1);
        click1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                startActivity(intent);
                Log.i("Tag","页面一taskId："+getTaskId());
            }
        });
    }
}





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Main2Activity.java


import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class Main2Activity extends AppCompatActivity {
    private Button click2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        click2=(Button)findViewById(R.id.click2);
        click2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent =new Intent(Main2Activity.this,Main3Activity.class);
                startActivity(intent);
                Log.i("Tag","页面二taskId:"+getTaskId());
            }
        });
    }
}





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Main3Activity.java
“`package cn.edu.bzu.alm;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class Main3Activity extends AppCompatActivity {
private Button click3;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main3);
    click3=(Button)findViewById(R.id.click3);
    click3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent =new Intent(Main3Activity.this,MainActivity.class);
            startActivity(intent);
            Log.i("Tag","页面三taskId:"+getTaskId());
        }
    });

}

}