text_background.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="18dp" />
<solid android:color="#1e000000" />
</shape>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#e9e9e9"
tools:context=".MainActivity">
<TextView
android:id="@+id/count_down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_margin="5dp"
android:background="@drawable/text_background"
android:padding="10dp"
android:text="跳转" />
</RelativeLayout>
MainActivity.java
package com.example.gl.countdown_text;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
/**
* 跳转
*/
private final static int COUNT = 1;
private TextView countDown;
private Timer timer;
private Handler handler = new Handler() {
int num = 5;
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case COUNT:
countDown.setText(String.valueOf("跳转:" + num) + "s");
num--;
break;
default:
break;
}
}
;
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化
initView();
}
private void initView() {
countDown = (TextView) findViewById(R.id.count_down);
//点击按钮进行直接跳转
countDown.setOnClickListener(this);
// sehedule的第二个参数是第一次启动延时的时间,第三个是每隔多长时间执行一次
timer = new Timer();
final long end = System.currentTimeMillis() + 1000 * 5;
timer.schedule(new TimerTask() {
@Override
public void run() {
handler.sendEmptyMessage(COUNT);
}
}, 0, 1000);
//这里的schedule的第二个参数意义是到了这个时间尽快运行run里面的方法
timer.schedule(new TimerTask() {
@Override
public void run() {
startActivity(new Intent(MainActivity.this, MyActivity.class));
finish();
timer.cancel();
}
}, new Date(end));
}
@Override
public void onClick(View v) {
switch (v.getId()) {
default:
break;
case R.id.count_down:
startActivity(new Intent(MainActivity.this, MyActivity.class));
//将timer进行取消
finish();
timer.cancel();
break;
}
}
}
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