GIF壓縮有問題，運行很順滑?。?！

1.自定義View——支持設(shè)置畫筆顏色，畫筆寬度，畫板顏色，清除畫板，檢查是否有簽名，保存畫板圖片（復(fù)制粘貼可直接使用）

/** * Created by YyyyQ on 2020/3/5. * 電子簽名 */public class SignatureView extends View { private Context context; //X軸起點 private float x; //Y軸起點 private float y; //畫筆 private final Paint paint = new Paint(); //路徑 private final Path path = new Path(); //畫布 private Canvas canvas; //生成的圖片 private Bitmap bitmap; //畫筆的寬度 private int paintWidth = 10; //簽名顏色 private int paintColor = Color.BLACK; //背景顏色 private int backgroundColor = Color.WHITE; //是否已經(jīng)簽名 private boolean isTouched = false; //簽名開始與結(jié)束 public interface Touch { void OnTouch(boolean isTouch); } private Touch touch; public SignatureView(Context context) { super(context); init(context); } public SignatureView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); init(context); } public SignatureView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } private void init(Context context) { this.context = context; //抗鋸齒 paint.setAntiAlias(true); //樣式 paint.setStyle(Paint.Style.STROKE); //畫筆顏色 paint.setColor(paintColor); //畫筆寬度 paint.setStrokeWidth(paintWidth); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); //創(chuàng)建于view大小一致的bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); canvas = new Canvas(bitmap); canvas.drawColor(backgroundColor); isTouched = false; } @Override public boolean onTouchEvent(MotionEvent event) { if (touch != null) touch.OnTouch(true); switch (event.getAction()) { //手指按下 case MotionEvent.ACTION_DOWN: touchDwon(event); break; //手指移動 case MotionEvent.ACTION_MOVE: isTouched = true; if (touch != null) touch.OnTouch(false); touchMove(event); break; //手指抬起 case MotionEvent.ACTION_UP: canvas.drawPath(path, paint); path.reset(); break; } // 更新繪制 invalidate(); return true; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //畫此次筆畫之前的簽名 canvas.drawBitmap(bitmap, 0, 0, paint); // 通過畫布繪制多點形成的圖形 canvas.drawPath(path, paint); } //手指按下的方法 private void touchDwon(MotionEvent event) { //重置繪制路徑 path.reset(); float downX = event.getX(); float downY = event.getY(); x = downX; y = downY; //繪制起點 path.moveTo(downX, downY); } //手指滑動的方法 private void touchMove(MotionEvent event) { //當(dāng)前的x,y坐標(biāo)點 final float moveX = event.getX(); final float moveY = event.getY(); //之前的x,y坐標(biāo)點 final float previousX = x; final float previousY = y; //獲取絕對值 final float dx = Math.abs(moveX - previousX); final float dy = Math.abs(moveY - previousY); if (dx >= 3 || dy >= 3) { float cX = (moveX + previousX) / 2; float cY = (moveY + previousY) / 2; path.quadTo(previousX, previousY, cX, cY); x = moveX; y = moveY; } } /** * 設(shè)置畫筆顏色 * * @param paintColor */ public void setPaintColor(int paintColor) { this.paintColor = paintColor; paint.setColor(paintColor); } /** * 設(shè)置畫筆寬度 * * @param paintWidth */ public void setPaintWidth(int paintWidth) { this.paintWidth = paintWidth; paint.setStrokeWidth(paintWidth); } /** * 設(shè)置畫板顏色 * * @param canvasColor */ public void setCanvasColor(int canvasColor) { this.backgroundColor = canvasColor; } /** * 清除畫板 */ public void clear() { if (canvas != null) { isTouched = false; //更新畫板 paint.setColor(paintColor); paint.setStrokeWidth(paintWidth); canvas.drawColor(backgroundColor, PorterDuff.Mode.CLEAR); invalidate(); } } /** * 獲取畫板的Bitmap * * @return */ public Bitmap getBitmap() { setDrawingCacheEnabled(true); buildDrawingCache(); Bitmap bitmap = getDrawingCache(); setDrawingCacheEnabled(false); return bitmap; } /** * 是否有簽名 * * @return */ public Boolean getSigstatus() { return isTouched; } /** * 保存畫板 * * @param path 保存到路徑 */ @SuppressLint('WrongThread') public Boolean save(String path) throws IOException { Bitmap bitmap = this.bitmap; ByteArrayOutputStream bos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, bos); byte[] buffer = bos.toByteArray(); if (buffer != null) { File file = new File(path); if (file.exists()) { file.delete(); } OutputStream outputStream = new FileOutputStream(file); outputStream.write(buffer); outputStream.close(); return true; } else { return false; } }}

2.xml布局引用自定義View（注意包名）

<?xml version='1.0' encoding='utf-8'?><LinearLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='match_parent' android:layout_height='match_parent' android:orientation='vertical'> <!--自定義view的絕對路徑--> <com.example.customviewdemo.view.SignatureView android: android:layout_width='match_parent' android:layout_height='0dp' android:layout_weight='1' android:background='#fff' /> <LinearLayout android:layout_width='match_parent' android:layout_height='50dp' android:layout_margin='20dp' android:orientation='horizontal'> <Button android: android:layout_width='0dp' android:layout_height='match_parent' android:layout_weight='1' android:gravity='center' android:text='清除' /> <Button android: android:layout_width='0dp' android:layout_height='match_parent' android:layout_marginLeft='10dp' android:layout_weight='1' android:gravity='center' android:text='是否簽名' /> <Button android: android:layout_width='0dp' android:layout_height='match_parent' android:layout_marginLeft='10dp' android:layout_weight='1' android:gravity='center' android:text='保存' /> </LinearLayout></LinearLayout>

3.Activity調(diào)用

/** * Created by YyyyQ on 2020/3/9. */public class SignatureActivity extends AppCompatActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_signature); SignatureView signatureView = findViewById(R.id.signature); //設(shè)置畫筆顏色(可以不設(shè)置--默認(rèn)畫筆寬度10,畫筆顏色黑,背景顏色白) signatureView.setPaintColor(Color.BLACK); signatureView.setPaintWidth(20); signatureView.setCanvasColor(Color.WHITE); //清除 Button clear = findViewById(R.id.clear); clear.setOnClickListener(view -> { signatureView.clear(); //設(shè)置畫筆顏色(可以不設(shè)置--默認(rèn)畫筆寬度10,畫筆顏色黑,背景顏色白) signatureView.setPaintColor(Color.BLACK); signatureView.setPaintWidth(20); signatureView.setCanvasColor(Color.WHITE); }); //是否含有簽名 Button isSignature = findViewById(R.id.isSignature); isSignature.setOnClickListener(view -> { if (signatureView.getSigstatus()) {Toast.makeText(SignatureActivity.this, '有簽名', Toast.LENGTH_SHORT).show(); } else {Toast.makeText(SignatureActivity.this, '無簽名', Toast.LENGTH_SHORT).show(); } }); //保存 Button save = findViewById(R.id.save); save.setOnClickListener(view -> { try {if (signatureView.save('/sdcard/YyyyQ.png')) { Toast.makeText(SignatureActivity.this, '保存成功', Toast.LENGTH_SHORT).show();} else { Toast.makeText(SignatureActivity.this, '保存失敗', Toast.LENGTH_SHORT).show();} } catch (IOException e) {e.printStackTrace(); } }); }}

總結(jié)

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