Question

我想在我的Android应用中写入外部存储，但我似乎无法获得正确的权限。该应用程序在Android 7上运行，因此我在运行时请求权限，如下所示：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);

if (permission != PackageManager.PERMISSION_GRANTED) {
    // We don't have permission so prompt the user
    int ACCESS_EXTERNAL_STORAGE_STATE = 1;
    ActivityCompat.requestPermissions(this,
            new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
            ACCESS_EXTERNAL_STORAGE_STATE);
}

permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);

if (permission != PackageManager.PERMISSION_GRANTED) {
    // We don't have permission so prompt the user
    int ACCESS_EXTERNAL_STORAGE_STATE = 1;
    ActivityCompat.requestPermissions(this,
            new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
            ACCESS_EXTERNAL_STORAGE_STATE);
}
...
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode)
        {
            case 1: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                {
                    //reload my activity with permission granted or use the features what required the permission
                } else
                {
                    Toast.makeText(this, "The app was not allowed to write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
                }
            }
        }
    }

我做的一个观察是onRequestPermissionsResult似乎返回没有授予权限，但是在启动应用程序以允许写入外部存储时我也从未被提示过。

我在Manifest中设置了这些权限：

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <application>

写入存储的代码在这里：

public static void appendByteBuffer(byte[] data)
{
    String filename = Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.raw";
    //filename value is "/storage/emulated/0/test.raw"
    File rawAudioFile = new File(filename);
    if (!rawAudioFile.exists())
    {
        try
        {
            rawAudioFile.createNewFile();
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    try (FileOutputStream output = new FileOutputStream(filename, true)) {
        output.write(data);
    } catch (IOException e) {}
}

03-16 14：50：49.988 19145-19306 /？ W / System.err：java.io.IOException：   许可被拒绝03-16 14：50：49.988 19145-19306 /？ W / System.err的：
  在java.io.UnixFileSystem.createFileExclusively0（本机方法）03-16   14：50：49.988 19145-19306 /？ W / System.err：at   java.io.UnixFileSystem.createFileExclusively（UnixFileSystem.java:280）   03-16 14：50：49.989 19145-19306 /？ W / System.err：at   java.io.File.createNewFile（File.java:948)03-16 14：50：49.989   19145-19306 /？ W / System.err：at   com.meeter.study.AppUtils.appendByteBuffer（AppUtils.java:76）03-16   14：50：49.989 19145-19306 /？ W / System.err：at

Answer 1

- delete: tableName: B where: COD_A = (SELECT COD_A FROM ${database.defaultSchemaName}.A WHERE name = 'A_NAME') - delete: tableName: A where: name = 'A_NAME'使用local i = 1 local function Move() transition.to(player, {time=timeTable[i+1], x=TableX[i+1], y=TableY[i+1]}) i=i+1 end timer.performWithDelay( timeTable[i], Move, 0 )代替ContextCompat：

替换：

ActivityCompat

使用：

checkSelfPermission

然后，添加permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE); permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);方法来处理ALLOW，DENY选择。希望这会有所帮助。

permission = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
permission = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);

在Android 7上写入外部存储

1 个答案: