Android touchpaint API

我正在玩touchpaint api，我想知道是否有人可以指出一些可以将绘图保存到sd卡的代码。

来自Android SDK示例中的sensors/src/aexp/sensors/SensorMonitor.java：

以下是创建文件的方式：

    private PrintWriter captureFile;

    File captureFileName = new File( "/sdcard", "capture.csv" );
        captureStateText = "Capture: "+captureFileName.getAbsolutePath();
        try {
            captureFile = new PrintWriter( new FileWriter( captureFileName, false ) );
        } catch( IOException ex ) {
            Log.e( LOG_TAG, ex.getMessage(), ex );
            captureStateText = "Capture: "+ex.getMessage();
        }

    if( captureFile != null ) {
            for( int i = 0 ; i < sensorEvent.values.length ; ++i ) {
                if( i > 0 )
                    captureFile.print( "," );
                captureFile.print( Float.toString( sensorEvent.values[i] ) );
            }
            captureFile.println();
    }
}

        captureFile.close();

以下是写入文件的方式：

    private PrintWriter captureFile;

    File captureFileName = new File( "/sdcard", "capture.csv" );
        captureStateText = "Capture: "+captureFileName.getAbsolutePath();
        try {
            captureFile = new PrintWriter( new FileWriter( captureFileName, false ) );
        } catch( IOException ex ) {
            Log.e( LOG_TAG, ex.getMessage(), ex );
            captureStateText = "Capture: "+ex.getMessage();
        }

    if( captureFile != null ) {
            for( int i = 0 ; i < sensorEvent.values.length ; ++i ) {
                if( i > 0 )
                    captureFile.print( "," );
                captureFile.print( Float.toString( sensorEvent.values[i] ) );
            }
            captureFile.println();
    }
}

        captureFile.close();