保存用戶在fingerPaint api演示中製作的圖像android

Question

嘿傢伙 我想構建一個簽名任務應用程序。 用戶將在其中創建簽名，並且該位圖應保存在手機中。 我創建了2個類文件，一個具有與fingerpaint應用程序中的自定義視圖相同的自定義視圖，並調用main.xml文件中的視圖。

在我的主應用程序類文件中，我有菜單按鈕，點擊保存SD卡中的位圖。以下是代碼： -

package org.testCircle; 

import android.app.Activity; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.os.Bundle; 
import android.provider.MediaStore.Images; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.TextView; 
import android.widget.Toast; 

public class testCircle extends Activity { 
    TextView tv; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     //setContentView(new customView(this)); 
     setContentView(R.layout.main); 
    } 
    public boolean onCreateOptionsMenu(Menu menu) { 
     super.onCreateOptionsMenu(menu); 

     menu.add(0, 1, 0, "save").setShortcut('3', 'c'); 
     return true; 
    } 
    public boolean onPrepareOptionsMenu(Menu menu) { 
     super.onPrepareOptionsMenu(menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
     case 1: 
      //new ColorPickerDialog(this, this, mPaint.getColor()).show(); 
      fingerPaint cv = new fingerPaint(this); 
      Bitmap viewBitmap = Bitmap.createBitmap(480, 800,Bitmap.Config.ARGB_8888); 
      Canvas canvas = new Canvas(viewBitmap); 
      cv.draw(canvas); 
      String url = Images.Media.insertImage(getContentResolver(), viewBitmap, "title", null); 
      Toast.makeText(testCircle.this, url, Toast.LENGTH_LONG).show(); 
      return true; 
    } 
     return super.onOptionsItemSelected(item); 
} 
} 

自定義視圖： -

package org.testCircle; 

import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import android.graphics.Paint; 
import android.graphics.Path; 
import android.os.Bundle; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.View; 

public class fingerPaint extends View { 
    Paint mPaint; 

    private static final float MINP = 0.25f; 
    private static final float MAXP = 0.75f; 

    private static Bitmap mBitmap; 
    private Canvas mCanvas; 
    private Path mPath; 
    private Paint mBitmapPaint; 

    public fingerPaint(Context c) { 
     super(c); 
     mPaint = new Paint(); 
     mPaint.setAntiAlias(true); 
     mPaint.setDither(true); 
     mPaint.setColor(0xFFFF0000); 
     mPaint.setStyle(Paint.Style.STROKE); 
     mPaint.setStrokeJoin(Paint.Join.ROUND); 
     mPaint.setStrokeCap(Paint.Cap.ROUND); 
     mPaint.setStrokeWidth(12); 
     mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888); 
     mCanvas = new Canvas(mBitmap); 
     mPath = new Path(); 
     mBitmapPaint = new Paint(Paint.DITHER_FLAG); 
    } 

    public fingerPaint(Context c , AttributeSet attrs){ 
     super(c , attrs); 
     mPaint = new Paint(); 
     mPaint.setAntiAlias(true); 
     mPaint.setDither(true); 
     mPaint.setColor(0xFFFF0000); 
     mPaint.setStyle(Paint.Style.STROKE); 
     mPaint.setStrokeJoin(Paint.Join.ROUND); 
     mPaint.setStrokeCap(Paint.Cap.ROUND); 
     mPaint.setStrokeWidth(12); 
     mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888); 
     mCanvas = new Canvas(mBitmap); 
     mPath = new Path(); 
     mBitmapPaint = new Paint(Paint.DITHER_FLAG); 
    } 

    public void onerase(){ 
     mCanvas=null; 
    } 

    @Override 
    protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
     super.onSizeChanged(w, h, oldw, oldh); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     canvas.drawColor(0xFFAAAAAA); 

     canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); 

     canvas.drawPath(mPath, mPaint); 
    } 

    private float mX, mY; 
    private static final float TOUCH_TOLERANCE = 4; 

    private void touch_start(float x, float y) { 
     mPath.reset(); 
     mPath.moveTo(x, y); 
     mX = x; 
     mY = y; 
    } 
    private void touch_move(float x, float y) { 
     float dx = Math.abs(x - mX); 
     float dy = Math.abs(y - mY); 
     if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { 
      mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); 
      mX = x; 
      mY = y; 
     } 
     mCanvas.drawBitmap(mBitmap, mX, mY, mPaint); 

    } 
    private void touch_up() { 
     mPath.lineTo(mX, mY); 
     // commit the path to our offscreen 
     mCanvas.drawPath(mPath, mPaint); 
     // kill this so we don't double draw 
     mPath.reset(); 
    } 


    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
     float x = event.getX(); 
     float y = event.getY(); 

     switch (event.getAction()) { 
      case MotionEvent.ACTION_DOWN: 
       touch_start(x, y); 
       invalidate(); 
       break; 
      case MotionEvent.ACTION_MOVE: 
       touch_move(x, y); 
       invalidate(); 
       break; 
      case MotionEvent.ACTION_UP: 
       touch_up(); 
       invalidate(); 
       Bundle b = new Bundle(); 

       break; 
     } 
     return true; 
    } 

} 

Answer 1

這裏是源代碼做

LinearLayout v = (LinearLayout) findViewById(R.id.mainLayout); 
v.setDrawingCacheEnabled(true); 
// this is the important code :) 
// Without it the view will have a 
// dimension of 0,0 and the bitmap will 
// be null 
v.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); 
v.layout(0, 0, v.getWidth(), v.getHeight()); 
v.buildDrawingCache(true); 
Bitmap bm = Bitmap.createBitmap(v.getDrawingCache()); 
v.setDrawingCacheEnabled(false); 
if (bm != null) { 
    try { 
     String path = Environment.getExternalStorageDirectory().toString(); 
     OutputStream fOut = null; 
     File file = new File(path, "screentest.jpg"); 
     fOut = new FileOutputStream(file); 
     bm.compress(Bitmap.CompressFormat.JPEG, 85, fOut); 
     fOut.flush(); 
     fOut.close(); 
     Log.e("ImagePath", "Image Path : " + MediaStore.Images.Media.insertImage(getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName())); 
    } 
    catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

希望這將與您還工作。

Answer 2

你有你的fingerPaint類Bitmap對象。將FileOutputStream實例化到您想要保存的位置，然後使用適當的選項和輸出流調用mBitmap.compress方法。記得關閉你的流。

Answer 3

final View content = findViewById(R.id.layoutFP); 
    content.setDrawingCacheEnabled(true); 
    Bitmap bitmap = content.getDrawingCache(); 
    String root = Environment.getExternalStorageDirectory().toString(); 
    File myDir = new File(root + "/saved_images");  
    myDir.mkdirs(); 
    Random generator = new Random(); 
    int n = 10000; 
    n = generator.nextInt(n); 
    String fname = "Image-"+ n +".jpg"; 
    File file = new File (myDir, fname); 
    if (file.exists()) file.delete(); 
    try { 
      FileOutputStream out = new FileOutputStream(file); 
      bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out); 
      out.flush(); 
      out.close(); 
      content.invalidate(); 
      sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory()))); 

    } catch (Exception e) { 
      e.printStackTrace(); 
    }finally{ 
     content.setDrawingCacheEnabled(false);       
    } 

最後在你的清單文件添加權限：

<使用許可權的android：NAME = 「android.permission.WRITE_EXTERNAL_STORAGE」/>