Question

hasFlash = getApplicationContext().getPackageManager()
                .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);  



Switch = (ImageButton) findViewById(R.id.Switch_off);    

Switch.setOnClickListener(new OnClickListener() {
    public void onClick( View vw) {
        if (vw.getId() == R.id.Switch_off && !hasFlash) {
            Log.d("tagname","string you want to execute");
            Toast.makeText(getApplicationContext(), 
                        "Sorry,your device doesn't support flashlight",
                         Toast.LENGTH_LONG).show();
        }
    }
});

我正在寻求按下开关，如果我没有闪光灯，我的吐司就出现了。虽然现在当我运行此代码时，即使我没有闪光灯也按下按钮，它会正常切换而不会打开任何闪光灯。有些设备可能没有闪存，这就是我想要的原因，当他们按下按钮给他们留下带有吐司的消息时

先谢谢！

Answer 1

尝试修改此代码，现在当设备没有闪光时，您的按钮将被禁用。

hasFlash = getApplicationContext().getPackageManager()
                .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);  



Switch = (ImageButton) findViewById(R.id.Switch_off);    

if (!hasFlash) {
            Log.d("tagname","string you want to execute");
            Toast.makeText(getApplicationContext(), 
                        "Sorry,your device doesn't support flashlight",
                         Toast.LENGTH_LONG).show();
        switch.setEnabled(false);
        }

Switch.setOnClickListener(new OnClickListener() {
    public void onClick( View vw) {
        //Do your work here
    }
});

如何点击一个按钮和吐司出现

1 个答案: