修改文件：

frameworks\base\media\java\android\mtp\MtpDatabase.java

修改方法：

  1. 增加导包

    1. ///START. Fix the display error on PC. By XiaFei, 20170503.
    2. import android.os.SystemProperties;
    3. ///import com.mediatek.xlog.SXlog;
    4. ///import com.mediatek.xlog.Xlog;
    5. import java.lang.Integer;
    6. ///END. Fix the display error on PC. By XiaFei, 20170503.

  2. 插入如下代码

    1. private int getDeviceProperty(int property, long[] outIntValue, char[] outStringValue) {
    2.  Log.d(TAG, "getDeviceProperty  property = 0x" + Integer.toHexString(property));
    4.  switch (property) {
    5.      case MtpConstants.DEVICE_PROPERTY_SYNCHRONIZATION_PARTNER:
    6.      case MtpConstants.DEVICE_PROPERTY_DEVICE_FRIENDLY_NAME:
    7.          // writable string properties kept in shared preferences
    8.          String value = mDeviceProperties.getString(Integer.toString(property), "");
    9.          int length = value.length();
    10.          if (length > 255) {
    11.              length = 255;
    12.          }
    13.          value.getChars(0, length, outStringValue, 0);
    14.          outStringValue[length] = 0;
    16.          ///START. Fix the display error on PC. By XiaFei, 20170503.
    17.          // Return the device name for the PC display if the FriendlyName is empty!!
    18.          String deviceName = SystemProperties.get("ro.product.name");
    19.          int lengthDeviceName = deviceName.length();
    20.          if (lengthDeviceName > 255) {
    21.              lengthDeviceName = 255;
    22.          }
    23.          if(lengthDeviceName >0) {
    24.              deviceName.getChars(0, lengthDeviceName, outStringValue, 0);
    25.              outStringValue[lengthDeviceName] = 0;
    26.              ///SXlog.d(TAG, "getDeviceProperty  deviceName = " + deviceName + ", lengthDeviceName = " + lengthDeviceName);
    27.          } else {
    28.              ///SXlog.d(TAG, "getDeviceProperty  lengthDeviceName = " + lengthDeviceName);
    29.          }
    30.          ///END. Fix the display error on PC. By XiaFei, 20170503.
    32.          return MtpConstants.RESPONSE_OK;
    34.      case MtpConstants.DEVICE_PROPERTY_IMAGE_SIZE:
    35.          // use screen size as max image size
    36.          Display display = ((WindowManager)mContext.getSystemService(
    37.              Context.WINDOW_SERVICE)).getDefaultDisplay();
    38.          int width = display.getMaximumSizeDimension();
    39.          int height = display.getMaximumSizeDimension();
    40.          String imageSize = Integer.toString(width) + "x" +  Integer.toString(height);
    41.          imageSize.getChars(0, imageSize.length(), outStringValue, 0);
    42.          outStringValue[imageSize.length()] = 0;
    43.          return MtpConstants.RESPONSE_OK;
    45.          // DEVICE_PROPERTY_BATTERY_LEVEL is implemented in the JNI code
    47.      default:
    48.          return MtpConstants.RESPONSE_DEVICE_PROP_NOT_SUPPORTED;
    49.  }
    50. }