如何在android中創建一個新文件夾DCIM

我實際上能夠捕捉照片並將其保存在android外部存儲DCIM文件夾中。如何在android中創建一個新文件夾DCIM

我的問題是，我不能在裏面創建一個新的文件夾，所以DCIM/MyPic.jpg成爲DCIM/MyFolder中/ MyPic.jpg。

這裏是我的源代碼：

File f = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "address"); 

if (!f.exists()) { 
    f.mkdir(); 
} 

File file = new File(Environment.getExternalStorageDirectory() 
    + File.separator 
    + "DCIM" 
    + File.separator 
    + "address" 
    + File.separator 
    , "IMG_001.jpg");

請注意，我正確的問WRITE_EXTERNAL_STORAGE許可清單中。

拍攝照片的意圖部分很好，因爲我可以直接將它保存到DCIM。

我沒有得到任何錯誤消息，但沒有任何反應......創造了無「地址」的文件夾:(

感謝您的幫助：d

來源

2016-06-01 Alexandre Martin

您正在運行哪個目標平臺？ –

Min：15，Target：23.我可以提到f.mkdir（）總是返回false。 –

我閱讀這篇文章，但它不幫助我解決我的問題：http://stackoverflow.com/questions/7212559/android-mkdir-returns-false –

張貼在評論，我想你的代碼，並它爲我工作。

MainActivity.java

public class MainActivity extends Activity { 

    private final static String TAG = MainActivity.class.getSimpleName(); 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     final File f = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "address"); 

     if (!f.exists()) { 
      Log.d(TAG, "Folder doesn't exist, creating it..."); 
      boolean rv = f.mkdir(); 
      Log.d(TAG, "Folder creation " + (rv ? "success" : "failed")); 
     } else { 
      Log.d(TAG, "Folder already exists."); 
     } 
    } 
}

AndroidManifest。 XML

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.tristan.testcreatedirectory"> 

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

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 

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

</application>

啓動應用程序我必須手動啓用權限，因爲我是在Android 6.

**日誌啓動應用程序時首次**之前

D/MainActivity: Folder doesn't exist, creating it... 
D/MainActivity: Folder creation success

**第二次啓動應用程序時的日誌**

D/MainActivity: Folder already exists.

來源

2016-06-01 02:59:11 Tristan

謝謝很多爲你的答案，但相同的代碼不適用於我:(我無法創建目錄，然後保存在其中的圖像。 –

當您運行我的代碼時是什麼日誌？可以將它粘貼給我嗎？ – Tristan

D/MainActivity：文件夾不存在，創建它... D/MainActivity：文件夾創建失敗 –

boolean hasPermission = (ContextCompat.checkSelfPermission(this, 
     Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED); 

if (!hasPermission) { 
    ActivityCompat.requestPermissions(this, 
      new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 
      REQUEST_WRITE_STORAGE); 
} 

else { 
    createFolder(); 
} 

@Override 
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { 
    super.onRequestPermissionsResult(requestCode, permissions, grantResults); 
    switch (requestCode) 
    { 
     case REQUEST_WRITE_STORAGE: { 
      if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
      { 
       //reload my activity with permission granted or use the features what required the permission 
       createFolder(); 

      } 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(); 
      } 
     } 
    } 

} 

public void createFolder() { 

    final File f = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "address"); 

    if (!f.exists()) { 
     Toast.makeText(this, "Folder doesn't exist, creating it...", Toast.LENGTH_SHORT).show(); 
     boolean rv = f.mkdir(); 
     Toast.makeText(this, "Folder creation " + (rv ? "success" : "failed"), Toast.LENGTH_SHORT).show(); 
    } else { 
     Toast.makeText(this, "Folder already exists.", Toast.LENGTH_SHORT).show(); 
    } 

}

來源

2016-06-01 14:03:33

如何在android中創建一個新文件夾DCIM

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