一.一些問題

1.1.Android中遇到button按鈕設置背景圖片無法顯示的解決方案

AS 4.2.版本

<!-- Base application theme. -->
Theme.MaterialComponents.DayNight.DarkActionBar ----> Theme.MaterialComponents.DayNight.DarkActionBar.Bridge

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <!--<style name="Theme.XH_Test" parent="Theme.MaterialComponents.DayNight.DarkActionBar">-->
    <style name="Theme.XH_Test" parent="Theme.MaterialComponents.DayNight.DarkActionBar.Bridge">
    <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>

1.2.Android11 文件存儲 新建文件

11-26 10:06:07.333 E/MediaProvider( 1075): insertFileIfNecessary failed
11-26 10:06:07.333 E/MediaProvider( 1075): java.lang.IllegalArgumentException: Primary directory null not allowed for content://media/external_primary/file; allowed directories are [Download, Documents]
11-26 10:06:07.333 E/MediaProvider( 1075):      at com.android.providers.media.MediaProvider.ensureFileColumns(MediaProvider.java:2923)
11-26 10:06:07.333 E/MediaProvider( 1075):      at com.android.providers.media.MediaProvider.ensureUniqueFileColumns(MediaProvider.java:2588)
11-26 10:06:07.333 E/MediaProvider( 1075):      at com.android.providers.media.MediaProvider.insertFile(MediaProvider.java:3282)
11-26 10:06:07.333 E/MediaProvider( 1075):      at com.android.providers.media.MediaProvider.insertInternal(MediaProvider.java:3826)
11-26 10:06:07.333 E/MediaProvider( 1075):      at com.android.providers.media.MediaProvider.insert(MediaProvider.java:3537)
11-26 10:06:07.333 E/MediaProvider( 1075):      at com.android.providers.media.MediaProvider.insertFileForFuse(MediaProvider.java:7187)
11-26 10:06:07.333 E/MediaProvider( 1075):      at com.android.providers.media.MediaProvider.insertFileIfNecessaryForFuse(MediaProvider.java:7281)
11-26 10:06:07.334 W/System.err( 4398): java.io.FileNotFoundException: /storage/emulated/0/voice_record.3gp: open failed: EPERM (Operation not permitted)
11-26 10:06:07.334 W/System.err( 4398):         at libcore.io.IoBridge.open(IoBridge.java:492)
11-26 10:06:07.334 W/System.err( 4398):         at java.io.RandomAccessFile.<init>(RandomAccessFile.java:289)
11-26 10:06:07.334 W/System.err( 4398):         at java.io.RandomAccessFile.<init>(RandomAccessFile.java:152)
11-26 10:06:07.334 W/System.err( 4398):         at android.media.MediaRecorder.prepare(MediaRecorder.java:1091)
11-26 10:06:07.334 W/System.err( 4398):         at com.xinhua.model.VoiceRecordTest.startAudioRecording(VoiceRecordTest.java:71)

代碼

sdFile = new File("/storage/external_sd/xinhua.txt");
sdFile.createNewFile();

解決方法

android:requestLegacyExternalStorage="true"　　　　

1.3.Android 11 打開WiFi設置開關

WIFI on:
adb shellsvc wifi enable
WIFI off:
adb shell svc wifi disable

　掃描WiFi列表

a.清單文件 加WiFi權限

    <!--wifi-->
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

b.startScan

        mWifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
        mTelephony = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
        //mWifiManager.setWifiEnabled(true);
        Toolkit.RootCommand("svc wifi enable");
        mWifiManager.startScan();　　

1.4.添加lib庫

build.grade

    sourceSets {
        main {
            jni {
                srcDirs 'src/main/jni', 'src/main/jniLibs'
            }
        }
    }

　　

總結

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