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android监听回到按钮事件

热度:57   发布时间:2016-05-01 19:18:50.0
android监听返回按钮事件
用户在点击手机的返回按钮时,默认是推出当前的activty,但是有时用户不小心按到返回,所以需要给用户一个提示,这就需要重写onkeydown事件,实现的效果如下:

实现代码如下:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    protected void dialog() {
        AlertDialog.Builder builder = new Builder(HanderTestActivty.this);
        builder.setMessage("确定要退出吗?");
        builder.setTitle("提示");
        builder.setPositiveButton("确认",
                new android.content.DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                        HanderTestActivty.this.finish();
                    }
                });
        builder.setNegativeButton("取消",
                new android.content.DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
        builder.create().show();
    }
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
            dialog();
            return false;
        }
        return false;
    }
.
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