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android繼承View實現畫圓
https://topic.csdn.net/u/20101127/00/d7cbe737-f9ef-4a19-ae0e-b61f7b447d5f.html
public class AndroidTest extends Activity {
private LinearLayout layout;
private LinearLayout.LayoutParams params1, params2;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
layout = (LinearLayout)findViewById(R.id.rootLayout);
params1 = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params2 = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
MyView myView1 = new MyView(this, 100, 100, 50);
myView1.setColor(Color.MAGENTA);
myView1.layout(50, 50, 150, 150);
myView1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
setTitle("MyView");
}
});
layout.addView(myView1, params1);
MyView smallCircle = new MyView(this, 125, 200, 25);
smallCircle.setColor(Color.GREEN);
smallCircle.layout(100, 175, 150, 225);
layout.addView(smallCircle, params2);
}
public class MyView extends View {
private float m_cx;
private float m_cy;
private float m_radius;
private Paint paint;
MyView(Context context, float cx, float cy, float radius) {
super(context);
m_cx = cx;
m_cy = cy;
m_radius = radius;
// 首先定義一個paint
paint = new Paint();
// 繪製矩形區域-實心矩形
// 設置顏色
paint.setColor(Color.BLUE);
// 設置樣式-填充
paint.setStyle(Style.FILL);
}
public void setColor(int color) {
// 設置顏色
paint.setColor(color);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
// draw circle
canvas.drawCircle(m_cx, m_cy, m_radius, paint);
}
}
}
最後更新：2017-04-02 16:47:59