如何使用画布设置绘制线的延迟
问题描述:
是android平台的新功能,并尝试为每个像素绘制延迟线。但是当执行代码时,他们不会延迟每个像素,他们将在完整循环执行后显示,我不知道为什么要这样做。我需要延迟每个像素,我的意思是在实时视图中将像素绘制为像素。有可能请建议示例代码或示例。感谢提前。如何使用画布设置绘制线的延迟
活动
public class MainActivity extends Activity {
ImageView drawingImageView;
int x1 = 50;
int y1 = 100;
int y2 = 100;
int i;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawingImageView = (ImageView) this.findViewById(R.id.DrawingImageView);
Bitmap bitmap = Bitmap.createBitmap((int) getWindowManager()
.getDefaultDisplay().getWidth(), (int) getWindowManager()
.getDefaultDisplay().getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawingImageView.setImageBitmap(bitmap);
// Line
Paint paint = new Paint();
paint.setColor(Color.GREEN);
paint.setStrokeWidth(5);
for (i = 0; i < 250; i++) {
try {
Thread.sleep(50);
} catch (InterruptedException ie) {
//error;
}
canvas.drawLine(x1, y1, x1 + i, y2, paint);
}
i++;
}}
答
请通过this.Hope这会为你工作去。 :)
公共类测试活动扩展AppCompatActivity {
ImageView drawingImageView;
int x1 = 50;
int y1 = 100;
int y2 = 100;
int x2=50, mCount = 1;
private Handler mHandler;
private Runnable mRunnable;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
drawingImageView = (ImageView) this.findViewById(R.id.DrawingImageView);
Bitmap bitmap = Bitmap.createBitmap((int) getWindowManager()
.getDefaultDisplay().getWidth(), (int) getWindowManager()
.getDefaultDisplay().getHeight(), Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(bitmap);
drawingImageView.setImageBitmap(bitmap);
final Paint paint = new Paint();
paint.setColor(Color.GREEN);
paint.setStrokeWidth(5);
canvas.drawLine(x1, y1, x2, y2, paint);
mHandler = new Handler(getMainLooper());
mRunnable = new Runnable() {
@Override
public void run() {
int x3 = x2 + mCount;
canvas.drawLine(x2, y1, x3, y2, paint);
x2 = x3;
mCount++;
drawingImageView.invalidate();
if (mCount < 150)
mHandler.postDelayed(mRunnable, 50);
}
};
mHandler.postDelayed(mRunnable,50);
}
}