2022-10-18学习内容

1.利用资源文件配置字符串

1.1activity_read_string.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_resource"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

1.2strings.xml

<resources>
    <string name="app_name">chapter04</string>
    <string name="weather_str">晴天</string>
</resources>

1.3ReadStringActivity.java

package com.example.chapter04;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class ReadStringActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_read_string);
        TextView tv_resource = findViewById(R.id.tv_resource);
        // 从string.xml获取名叫weather_str的字符串值
        String value = getString(R.string.weather_str);
        tv_resource.setText(value);
    }
}

1.4效果：

2.利用元数据传递配置信息

2.1activity_meta_data.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_meta"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

2.2AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.chapter04">

    <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.MyApplication">
        <activity
            android:name=".ActResponseActivity"
            android:exported="false" />
        <activity
            android:name=".ActReceiveActivity"
            android:exported="false" />
        <activity
            android:name=".LoginSuccessActivity"
            android:exported="false" />
        <activity
            android:name=".JumpSecondActivity"
            android:exported="false" />
        <activity
            android:name=".ActFinishActivity"
            android:exported="false" />
        <activity
            android:name=".MetaDataActivity"
            android:exported="true"
            android:launchMode="standard">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

            <meta-data android:name="weather" android:value="晴天"/>
        </activity>
    </application>

</manifest>

2.3MetaDataActivity.java

package com.example.chapter04;

import androidx.appcompat.app.AppCompatActivity;

import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.TextView;

public class MetaDataActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_meta_data);
        TextView tv_meta = findViewById(R.id.tv_meta);
        // 获取应用包管理器
        PackageManager pm = getPackageManager();
        try {
            // 从应用包管理器中获取当前的活动信息
            ActivityInfo info = pm.getActivityInfo(getComponentName(), PackageManager.GET_META_DATA);
            // 获取活动附加的元数据信息
            Bundle bundle = info.metaData;
            String weather = bundle.getString("weather");
            tv_meta.setText(weather);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
    }
}

2.4效果：

3.给应用页面注册快捷方式

3.1shortcuts.xml

<?xml version="1.0" encoding="utf-8"?>
<shotcuts xmlns:android="http://schemas.android.com/apk/res/android">
    <shortcut
        android:shortcutId="first"
        android:enabled="true"
        android:icon="@mipmap/ic_launcher_round"
        android:shortcutShortLabel="@string/first_short"
        android:shortcutLongLabel="@string/first_long">

        <intent
            android:action="android.intent.action.VIEW"
            android:targetPackage="com.example.chapter04"
            android:targetClass="com.example.chapter04.ActStartActivity"/>
        <categories android:name="android.shortcut.conversation" />
    </shortcut>

    <shortcut
        android:shortcutId="second"
        android:enabled="true"
        android:icon="@mipmap/ic_launcher_round"
        android:shortcutShortLabel="@string/second_short"
        android:shortcutLongLabel="@string/second_long">

        <intent
            android:action="android.intent.action.VIEW"
            android:targetPackage="com.example.chapter04"
            android:targetClass="com.example.chapter04.JumpFirstActivity"/>
        <categories android:name="android.shortcut.conversation" />
    </shortcut>

    <shortcut
        android:shortcutId="third"
        android:enabled="true"
        android:icon="@mipmap/ic_launcher_round"
        android:shortcutShortLabel="@string/third_short"
        android:shortcutLongLabel="@string/third_long">

        <intent
            android:action="android.intent.action.VIEW"
            android:targetPackage="com.example.chapter04"
            android:targetClass="com.example.chapter04.LoginInputActivity"/>
        <categories android:name="android.shortcut.conversation" />
    </shortcut>
</shotcuts>

3.2strings.xml

<resources>
    <string name="app_name">chapter04</string>
    <string name="weather_str">晴天</string>
    <string name="first_short">first</string>
    <string name="first_long">启停活动</string>
    <string name="second_short">second</string>
    <string name="second_long">来回跳转</string>
    <string name="third_short">third</string>
    <string name="third_long">登录返回</string>
</resources>

3.3AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.chapter04">

    <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.MyApplication">
        <activity
            android:name=".ActResponseActivity"
            android:exported="false" />
        <activity
            android:name=".ActReceiveActivity"
            android:exported="false" />
        <activity
            android:name=".LoginSuccessActivity"
            android:exported="false" />
        <activity
            android:name=".JumpSecondActivity"
            android:exported="false" />
        <activity
            android:name=".JumpFirstActivity"
            android:exported="true" />
        <activity
            android:name=".LoginInputActivity"
            android:exported="true" />
        <activity
            android:name=".ActFinishActivity"
            android:exported="false" />
        <activity
            android:name=".MetaDataActivity"
            android:exported="true"
            android:launchMode="standard">

            <meta-data android:name="weather" android:value="晴天"/>
        </activity>
        <activity
            android:name=".ActStartActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

            <meta-data
                android:name="android.app.shortcuts"
                android:resource="@xml/showcuts"/>
        </activity>
    </application>

</manifest>

3.4效果：

点快捷方式“启停活动”：

 

点快捷方式“来回跳转”：

 

 

点快捷方式“登录返回”：