1. 低于Android R版本
1.1 修改AndroidManifest.xml :
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application android:requestLegacyExternalStorage="true"
1.2 代碼增權重限申請
if (ContextCompat.checkSelfPermission(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(this,
Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
//多個權限一起申請
ActivityCompat.requestPermissions(this, new String[]{
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_EXTERNAL_STORAGE,
}, 1);
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permission, int[] grantResult) {
super.onRequestPermissionsResult(requestCode, permission, grantResult);
switch (requestCode) {
case 1:
if (grantResult.length>0){
boolean readper = grantResult[0] == PackageManager.PERMISSION_GRANTED;
if(readper){
Toast.makeText(getApplicationContext(), "Permission Granted", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(getApplicationContext(), "Permission Denied", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "You Denied Permission", Toast.LENGTH_SHORT).show();
}
break;
default:
break;
}
}
2. 高于Android R版本
2.1 方法1: 申請MANAGE_EXTERNAL_STORAGE權限
修改AndroidManifest.xml : <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" android:minSdkVersion="30" />
public void askForPermissions() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
if (!Environment.isExternalStorageManager()) {
Intent intent = new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION);
intent.setData(Uri.parse("package:" + getPackageName()));
startActivityForResult(intent, REQ_PERMISSION_CODE);
}
}
}
2.2 方法2:通過InputStream/OutputStream讀寫檔案
//通過FileOutputStream 寫檔案
public static FileOutputStream GetFileOutputStreamFromFile(String fileUrl, Context context){
FileOutputStream Fout = null;
OutputStream out = null;
//擷取檔案名
String FileName = fileUrl.substring(fileUrl.lastIndexOf("/") + 1).toLowerCase();
Log.i(TAG,"GetFileOutputStreamFromFile2->FileName:"+ FileName);
final ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_MUSIC + File.separator + "AudioTest"); //路徑
values.put(MediaStore.MediaColumns.DISPLAY_NAME, FileName);//檔案名
values.put(MediaStore.MediaColumns.MIME_TYPE, "audio/basic");
values.put(MediaStore.MediaColumns.IS_PENDING, 1);
ContentResolver resolver = context.getContentResolver();
final Uri uri=resolver.insert(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, values);
//uri轉換為string路徑
Log.i(TAG,"GetFileOutputStreamFromFile2->uri:"+ uri);
String[] proj = { MediaStore.Audio.Media.DATA };
Cursor cursor = resolver.query(uri,proj,null,null,null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
cursor.moveToFirst();
String file_path = cursor.getString(column_index);
Log.i(TAG,"GetFileOutputStreamFromFile2->path:"+ file_path);
PCMFilePath = file_path;
//openOutputStream
try {
out = resolver.openOutputStream(uri);
}catch (IOException e) {
e.printStackTrace();
}
//OutputStream轉FileOutputStream
if (out instanceof FileOutputStream) {
Fout = (FileOutputStream) out;
}else{
Log.e(TAG,"converto FileOutputStream failed.");
}
return Fout;
}
//讀檔案
public static FileInputStream GetFileInputStreamFromFile(String fileUrl)
FileInputStream Fin = null;
File file_in = new File(fileUrl);
try {
Fin = new FileInputStream(file_in);
}catch (IOException e) {
e.printStackTrace();
return;
}
return Fin;
}