Android启动模式

来源：互联网发布：jsp的java代码编辑：程序博客网时间：2024/05/21 07:10

在layout，activity_main.xml中写入代码：

<?xml version="1.0" encoding="utf-8"?><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"    tools:context="cn.edu.bzu.maintest.MainActivity">    <Button        android:id="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第一个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <Button        android:id="@+id/button2"        android:onClick="click2"        android:layout_below="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第二个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <Button        android:id="@+id/button3"        android:onClick="click3"        android:layout_below="@+id/button2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第三个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <TextView        android:layout_below="@+id/button3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="50sp"        android:text="第一个页面" /></RelativeLayout>

在layout，activity_main2.xml中写入代码：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main2"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="cn.edu.bzu.maintest.Main2Activity">    <Button        android:id="@+id/button1"        android:onClick="click1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第一个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <Button        android:id="@+id/button2"        android:layout_below="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第二个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <Button        android:id="@+id/button3"        android:onClick="click3"        android:layout_below="@+id/button2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第三个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <TextView        android:layout_below="@+id/button3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="50sp"        android:text="第二个页面" /></RelativeLayout>

在layout，activity_main3.xml中写入代码：

<?xml version="1.0" encoding="utf-8"?><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"    tools:context="cn.edu.bzu.maintest.Main3Activity">    <Button        android:id="@+id/button1"        android:onClick="click1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第一个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <Button        android:id="@+id/button2"        android:onClick="click2"        android:layout_below="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第二个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <Button        android:id="@+id/button3"        android:layout_below="@+id/button2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="第三个页面"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="30dp"/>    <TextView        android:layout_below="@+id/button3"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="50sp"        android:text="第三个页面" /></RelativeLayout>

在mainifests中的AndroidMainifest.xml中代码如下：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.edu.bzu.maintest">    <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" ></activity>        <activity android:name=".Main3Activity"></activity>    </application></manifest>

在Java文件下的cn.edu.bzu.maintest中，MainActivity代码如下：

package cn.edu.bzu.maintest;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void click2(View view){        Intent intent=new Intent(this,Main2Activity.class);        startActivity(intent);        Log.i("Tag","页面二taskId:"+getTaskId());    }    public void click3(View view){        Intent intent=new Intent(this,Main3Activity.class);        startActivity(intent);        Log.i("Tag","页面三taskId:"+getTaskId());    }}

在Java文件下的cn.edu.bzu.maintest中，Main2Activity代码如下：

package cn.edu.bzu.maintest;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 {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);    }    public void click1(View view){        Intent intent=new Intent(this,MainActivity.class);        startActivity(intent);        Log.i("Tag","页面一taskId:"+getTaskId());    }    public void click3(View view){        Intent intent=new Intent(this,Main3Activity.class);        startActivity(intent);        Log.i("Tag","页面三taskId:"+getTaskId());    }}

在Java文件下的cn.edu.bzu.maintest中，Main3Activity代码如下：

package cn.edu.bzu.maintest;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;public class Main3Activity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);    }    public void click1(View view){        Intent intent=new Intent(this,MainActivity.class);        startActivity(intent);        Log.i("Tag","页面一taskId:"+getTaskId());    }    public void click2(View view){        Intent intent=new Intent(this,Main2Activity.class);        startActivity(intent);        Log.i("Tag","页面二taskId:"+getTaskId());    }}

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