Hander

最新推荐文章于 2020-08-10 11:33:40 发布

qq_42828340

最新推荐文章于 2020-08-10 11:33:40 发布

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本文链接：https://blog.youkuaiyun.com/qq_42828340/article/details/84348759

本文介绍了一种在Android应用中实现倒计时后自动跳转到下一个Activity的方法。通过Handler发送延迟消息更新按钮文本并控制Activity跳转，展示了如何在用户等待期间提供视觉反馈。

public class TwoActivity extends AppCompatActivity {

int time=5;
private Button button;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_two);
    //获取控件
    ImageView imageView = findViewById(R.id.imageView_dao);
    button = findViewById(R.id.button_dao);

    handler.sendEmptyMessage(0);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(TwoActivity.this,ThreeActivity.class));
            finish();
        }
    });

}


Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what) {

            case 0:

                time--;
                button.setText("跳过"+time+"s");
                if (time<=0) {
                    startActivity(new Intent(TwoActivity.this,ThreeActivity.class));
                    finish();
                }

                sendEmptyMessageDelayed(0,1000);

                break;
        }
    }
};//创建hander


@Override
protected void onDestroy() {
    super.onDestroy();

    handler.removeMessages(0);
}

}