Android显式启动

打开应用主页面后，点击按钮跳转到新页面

AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mapplication">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />


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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        //将第二个页面添加到配置文件
        <activity android:name=".BankActivity">

        </activity>


    </application>

</manifest>

activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

//主页面设置按钮
    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="跳转"
         />


</androidx.constraintlayout.widget.ConstraintLayout>

line_layout.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".BankActivity">
    <!--
    android:orientation="vertical"控件排列方式垂直排列
    android:orientation = "horizontal"控件排列方式水平排列
    不设定此属性表示默认水平排列
    -->
//新页面
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:background="#ADFF2F"
        android:tooltipText="绿色背景，模拟pc鼠标悬停出现描述信息"
        android:layout_weight="1"/>

    <!--
	android:layout_width="match_parent"表示占用与父组件一样的长度
    android:layout_width="wrap_content"表示占用足够把信息包裹起来的空间大小
    android:layout_width="fill_parent"表示占用所有宽度，高度足够包裹就行
    android:layout_height="fill_parent"表示占用所有高度，宽度足够就行
    android:layout_width="fill_parent",android:layout_height="fill_parent"表示占据整个屏幕空间
    android:background="#ADFF2F"背景色

    -->
    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="12345"/>
<!---->
    <View
        android:layout_width="match_parent"
        android:layout_height="3dp"
        android:background="#000000"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="bcd"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2"/>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:background="#DA70D6"
        android:layout_weight="1"/>



</LinearLayout>

MainActivity.java

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package com.example.mapplication;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.KeyEventDispatcher;

import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.GridLayout;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt = (Button)findViewById(R.id.btn1);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //第一种
//                Intent intent = new Intent(MainActivity.this,BankActivity.class);
//                startActivity(intent);
                //显示启动第一种的另一写法
//                Intent intent = new Intent();
//                intent.setClass(MainActivity.this,BankActivity.class);
//                startActivity(intent);
                //第二种
//                Intent intent = new Intent();
//                intent.setClassName(MainActivity.this,"com.example.mapplication.BankActivity");
//                startActivity(intent);
                //第三种
                Intent intent = new Intent();
                ComponentName componentName = new ComponentName(MainActivity.this,BankActivity.class);
                intent.setComponent(componentName);
                startActivity(intent);
            }
        });

    }

}

BankActivity.java

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package com.example.mapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

import androidx.annotation.Nullable;

public class BankActivity extends Activity {
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //显示跳转的新页面
        setContentView(R.layout.linear_layout);

    }

}

隐式启动

需要在xml文件中配置action属性，同时将category属性配置为default

AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mapplication">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MApplication">
        <activity android:name=".MainActivity">
            <intent-filter>
                //主页面
                <action android:name="android.intent.action.MAIN" />
                //启动器
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".BankActivity">
            <intent-filter>
                //需要在xml文件中配置action属性，同时将category属性配置为default
                <action android:name="abcd.BankActivity"></action>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>

    </application>

</manifest>

MainActivity.java

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package com.example.mapplication;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.view.KeyEventDispatcher;

import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.GridLayout;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt = (Button)findViewById(R.id.btn1);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //隐式启动 第一种
//                Intent intent = new Intent("abcd.BankActivity");
//                startActivity(intent);
                //第二种
                Intent intent = new Intent();
                intent.setAction("abcd.BankActivity");
                startActivity(intent);

            }
        });

    }

}

关闭新打开的页面，回到旧的主页面

在第二个页面布局文件中使用按钮，点击时关闭新页面。

line_layout.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".BankActivity">
    <!--
    android:orientation="vertical"控件排列方式垂直排列
    android:orientation = "horizontal"控件排列方式水平排列
    不设定此属性表示默认水平排列
    -->

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:background="#ADFF2F"
        android:tooltipText="绿色背景，模拟pc鼠标悬停出现描述信息"
        android:layout_weight="1"/>

    <!--
    android:layout_width="wrap_content"表示占用足够把信息包裹起来的空间大小
    android:layout_width="fill_parent"表示占用所有宽度，高度足够包裹就行
    android:layout_height="fill_parent"表示占用所有高度，宽度足够就行
    android:layout_width="fill_parent",android:layout_height="fill_parent"表示占据整个屏幕空间
    android:background="#ADFF2F"背景色

    -->
    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="回退"/>
<!---->
    <View
        android:layout_width="match_parent"
        android:layout_height="3dp"
        android:background="#000000"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="bcd"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2"/>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:background="#DA70D6"
        android:layout_weight="1"/>
</LinearLayout>

BankActivity.java

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package com.example.mapplication;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

import androidx.annotation.Nullable;

public class BankActivity extends Activity {
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.linear_layout);
        Button button = (Button) findViewById(R.id.btn2);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //关闭自己
                BankActivity.this.finish();
            }
        });

    }

}

如果有两个页面都符合隐式启动的条件，会弹出选择框选择。

AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mapplication">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="主页面"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.MApplication">
        <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=".BankActivity"
            android:label="第二个页面">
            <intent-filter>
                <action android:name="abcd.BankActivity"></action>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>


        <activity android:name=".ThindActivity"
            android:label="第三个页面">
            <intent-filter>
                <action android:name="abcd.BankActivity"></action>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </activity>

    </application>

</manifest>

ThindActivity.java

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package com.example.mapplication;

import android.app.Activity;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.view.View;
import android.widget.Button;

import androidx.annotation.Nullable;

public class ThindActivity extends Activity {
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.thind_layout);
        Button button = (Button) findViewById(R.id.bitn3);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ThindActivity.this.finish();
            }
        });
    }
}

thind_layout.xml

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="33333333"/>
    <Button
        android:id="@+id/bitn3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="回退1"/>

</androidx.constraintlayout.widget.ConstraintLayout>