Java 用单选按钮关闭Android操作
我目前正试图使我的项目,以便当其中一个单选按钮被选中,并举行一个按钮,然后它产生选定的声音。但是,当我使用ACTION_DOWN功能时,不会产生噪音。任何帮助都会很好Java 用单选按钮关闭Android操作,java,android,button,radio-button,audiotrack,Java,Android,Button,Radio Button,Audiotrack,我目前正试图使我的项目,以便当其中一个单选按钮被选中,并举行一个按钮,然后它产生选定的声音。但是,当我使用ACTION_DOWN功能时,不会产生噪音。任何帮助都会很好 public boolean onTouch(View v, MotionEvent event) { int frequency = Integer.parseInt(frequencyInput.getText().toString()); displayFrequency.setText(String.val
public boolean onTouch(View v, MotionEvent event) {
int frequency = Integer.parseInt(frequencyInput.getText().toString());
displayFrequency.setText(String.valueOf(frequency));
sineWave.setSine(frequency);
squareWave.setSquareWave(frequency);
sawWave.setSawWave(frequency);
boolean on = ((startStop.isPressed()) && sine.isChecked());
boolean sqOn = ((startStop.isPressed()) && square.isChecked());
boolean sawOn =((startStop.isPressed()) && saw.isChecked());
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (on)
{
sineWave.start();
}
else if (sqOn)
{
squareWave.start();
}
else if (sawOn)
{
sawWave.start();
}
break;
case MotionEvent.ACTION_UP:
if (!on) {
sineWave.stop();
}
if (!sqOn) {
squareWave.stop();
}
if (!sawOn) {
sawWave.stop();
;
}
break;
}
主要问题是,当您仍在触摸时,您检查了
isPressed()
,因此按钮的按下状态尚未设置
如果将onTouchListener
直接添加到startStop按钮,则可以确保每次调用它时触发事件的都是startStop按钮。这允许您删除startStop.isPressed()
检查
startStop.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int frequency = Integer.parseInt(frequencyInput.getText().toString());
displayFrequency.setText(String.valueOf(frequency));
sineWave.setSine(frequency);
squareWave.setSquareWave(frequency);
sawWave.setSawWave(frequency);
boolean on = sine.isChecked();
boolean sqOn = square.isChecked();
boolean sawOn = saw.isChecked();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (on) {
sineWave.start();
} else if (sqOn) {
squareWave.start();
} else if (sawOn) {
sawWave.start();
}
break;
case MotionEvent.ACTION_UP:
if (!on) {
sineWave.stop();
}
if (!sqOn) {
squareWave.stop();
}
if (!sawOn) {
sawWave.stop();
}
break;
default:
return false;
}
return true;
}
});
我的猜测是,在调用
onTouch
时,startStop.isPressed()
isfalse
仍然不能作为主要活动并实现onTouchListener,它需要保持抽象。这基本上是我建议的要点:不要在活动中全局实现OnTouchListener,而是直接为按钮实现。如果您真的想在活动中实现listener,可以在xml中为按钮设置一个标记,并在onTouch回调开始时检查。