我有一个自定义视图，我在Android中使用画布绘制了6个圆圈。这些圈子充当Page指标;这意味着在每个圆圈的点击（使用画布绘制）时，不同的项目将显示在视图寻呼机中。现在我的要求是为每个圈子设置单独的焦点，并为每个圈子设置不同的可访问性。请帮忙。提前致谢。 谢谢， 勒凯什
答案 0 :(得分：2)
我必须使用ExploreByTouchHelper来满足我的要求，正如@alanv和@pskink在评论中所解释的那样。
https://youtu.be/ld7kZRpMGb8?t=1196
谢谢你们！
答案 1 :(得分：0)
您应该使用View.getX（）和View.getY（）获取视图的位置以获取左上角的x和y，并假设您知道半径（或者能够获得视图的宽度/高度）确定半径）。之后，获得：
xTouch = MotionEvent.getX();
yTouch = MotionEvent.getY();
然后检查条件是否：
(xTouch - (x + radius)) * (xTouch - (x + radius)) + (yTouch - (y + radius)) * (yTouch - (y + radius)) <= radius * radius
该公式只是对学校几何的解释，用于确定点是否在圆圈区域内。有关更多详细信息，请参阅笛卡尔坐标的圆等式。
值解释是：
（x +半径）和（y +半径）是圆的中心。
（xTouch - （x + radius））是从触摸点到中心的距离X.
（yTouch - （y + radius））是从触摸点到中心的距离Y.
如果TackBack已打开，则每个圆圈的可访问性和可读性文本都将被读取，因此完整方案的代码为：
package com.example.hello_world;
import java.util.Locale;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Path.Direction;
import android.graphics.RectF;
import android.graphics.Region;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity implements OnInitListener {
String mText_To_Speach_text;
private int MY_DATA_CHECK_CODE = 0;
TextToSpeech myTTS;
int initStatus = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new MyView(this));
Intent checkTTSIntent = new Intent();
checkTTSIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
startActivityForResult(checkTTSIntent, MY_DATA_CHECK_CODE);
}
class MyView extends View {
private Path mPath, mPath2, mPath3, mPath4, mPath5;
private Paint mPaint;
private RectF mOval, mOval2;
Region mRegion1, mRegion2, mRegion3, mRegion4, mRegion5, mRegion6;
public MyView(Context context) {
super(context);
mPath = new Path();
mPath2 = new Path();
mPath3 = new Path();
mPath4 = new Path();
mPath5 = new Path();
mPaint = new Paint();
mPaint.setColor(0xffff0000);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mPath.reset();
mPath.addCircle((w / 2) - 120, h / 2, 30, Direction.CW);
mPath.close();
mPath2.reset();
mPath2.addCircle((w / 2) - 60, h / 2, 30, Direction.CW);
mPath2.close();
mPath3.reset();
mPath3.addCircle(w / 2, h / 2, 30, Direction.CW);
mPath3.close();
mPath4.reset();
mPath4.addCircle((w / 2) + 60, h / 2, 30, Direction.CW);
mPath4.close();
mPath5.reset();
mPath5.addCircle((w / 2) + 120, h / 2, 30, Direction.CW);
mPath5.close();
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xffffffff);
mPaint.setStyle(Style.FILL);
canvas.drawPath(mPath, mPaint);
canvas.drawPath(mPath2, mPaint);
canvas.drawPath(mPath3, mPaint);
canvas.drawPath(mPath4, mPaint);
canvas.drawPath(mPath5, mPaint);
RectF rectF1 = new RectF();
mPath.computeBounds(rectF1, true);
mRegion1 = new Region();
mRegion1.setPath(mPath, new Region((int) rectF1.left,
(int) rectF1.top, (int) rectF1.right, (int) rectF1.bottom));
RectF rectF2 = new RectF();
mPath2.computeBounds(rectF2, true);
mRegion2 = new Region();
mRegion2.setPath(mPath2, new Region((int) rectF2.left,
(int) rectF2.top, (int) rectF2.right, (int) rectF2.bottom));
RectF rectF3 = new RectF();
mPath3.computeBounds(rectF3, true);
mRegion3 = new Region();
mRegion3.setPath(mPath3, new Region((int) rectF3.left,
(int) rectF3.top, (int) rectF3.right, (int) rectF3.bottom));
RectF rectF4 = new RectF();
mPath4.computeBounds(rectF4, true);
mRegion4 = new Region();
mRegion4.setPath(mPath4, new Region((int) rectF4.left,
(int) rectF4.top, (int) rectF4.right, (int) rectF4.bottom));
RectF rectF5 = new RectF();
mPath5.computeBounds(rectF5, true);
mRegion5 = new Region();
mRegion5.setPath(mPath5, new Region((int) rectF5.left,
(int) rectF5.top, (int) rectF5.right, (int) rectF5.bottom));
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
if (event.getAction() == MotionEvent.ACTION_DOWN) {
if (mRegion1.contains(x, y)) {
mText_To_Speach_text = "Circle1";
speakWords(mText_To_Speach_text);
} else if (mRegion2.contains(x, y)) {
mText_To_Speach_text = "Circle2";
speakWords(mText_To_Speach_text);
} else if (mRegion3.contains(x, y)) {
mText_To_Speach_text = "Circle3";
speakWords(mText_To_Speach_text);
} else if (mRegion4.contains(x, y)) {
mText_To_Speach_text = "Circle4";
speakWords(mText_To_Speach_text);
} else if (mRegion5.contains(x, y)) {
mText_To_Speach_text = "Circle5";
speakWords(mText_To_Speach_text);
}
}
return true;
}
}
private void speakWords(String speech) {
myTTS.speak(speech, TextToSpeech.QUEUE_FLUSH, null);
}
@Override
public void onInit(int status) {
if (initStatus == TextToSpeech.SUCCESS) {
if (myTTS.isLanguageAvailable(Locale.US) == TextToSpeech.LANG_AVAILABLE)
myTTS.setLanguage(Locale.US);
} else if (initStatus == TextToSpeech.ERROR) {
Toast.makeText(this, "Sorry! Text To Speech failed...",
Toast.LENGTH_LONG).show();
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == MY_DATA_CHECK_CODE) {
if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS) {
myTTS = new TextToSpeech(this, this);
} else {
Intent installTTSIntent = new Intent();
installTTSIntent
.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
startActivity(installTTSIntent);
}
}
}
}