Question

我想在Onclick功能的图像视图中更改图像。我已经尝试过了：

bt_audiocapture.setOnClickListener(new View.OnClickListener() {

        public void onClick(View view) {

            if (checkPermission()) {

                if (bt_audiocapture.getResources().getDrawable(R.drawable.ic_mic).equals(R.drawable.ic_mic)) {
                    start();
                    bt_audiocapture.setImageResource(R.drawable.ic_stop);
                } else if (bt_audiocapture.getResources().getDrawable(R.drawable.ic_stop).equals(R.drawable.ic_stop)) {
                    stop();
                    bt_audiocapture.setImageResource(R.drawable.ic_play);
                } else if (bt_audiocapture.getResources().getDrawable(R.drawable.ic_play).equals(R.drawable.ic_play)) {
                    play();
                }
            }
        }
    });

Answer 1

bt_audiocapture.getResources().getDrawable(R.drawable.ic_mic)会返回Drawable个对象。您无法将其与R.drawable.ic_mic进行比较，即integer。这类似于将car与green color进行比较。

要完成任务，请创建一些字段，如private int state = 0;，以及一些常量，如

private final STATE_PLAYING = 1;
private final STATE_STOPPED = 2;
private final STATE_NONE = 0;

然后：

if (state == STATE_NONE) {
    start();
    bt_audiocapture.setImageResource(R.drawable.ic_stop);
    state = STATE_PLAYING;
} else if (state == STATE_PLAYING) {
    stop();
    bt_audiocapture.setImageResource(R.drawable.ic_play);
    state = STATE_STOPPED;
} else if (state == STOPPED) {
    play();
    state = STATE_PLAYING;
}

Answer 2

您的equals表达式总是返回false，我希望您的if块都不会被执行。你调试了那段代码吗？

我建议将状态保存在另一个变量中，例如使用enum。

此外，出于性能原因，您应该使用setImageDrawable。请参阅setImageResource的javadoc：

这会在UI线程上进行Bitmap读取和解码，这会导致延迟打嗝

Answer 3

试试这段代码，它适合我： -

 img = (ImageView) findViewById(R.id.img);
    img.setTag(0);
    img.setImageResource(R.drawable.images);
    img.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            if (Integer.parseInt(img.getTag().toString()) == 0) {
                img.setImageResource(R.drawable.cam);
                img.setTag(1);

            } else {
                img.setImageResource(R.drawable.images);
                img.setTag(0);

            }
        }
    });

更改imageview onClick中的图像

3 个答案: