5S跳转页面

MainActivity.java

package com.bw.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

public class MainActivity extends Activity {

private TextView text_time;
// 2 定义倒计时变量
int time = 5;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    // 1 找控件
    text_time = (TextView) findViewById(R.id.text_time);
    // 3 点击跳转
    text_time.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            // 4 倒计时等于0跳转
            time = 0;
        }
    });
    // 7 发送handler
    handler.sendEmptyMessage(0);
    // 5 设置新的时间
    text_time.setText("跳转" + time);
}

// 6 创建Handler
Handler handler = new Handler() {
    public void handleMessage(android.os.Message msg) {
        // 8 switch 选择
        switch (msg.what) {
        case 0:
            // 9 如果time小于或者等于0 跳转新的页面
            if (time <= 0) {
                startActivity(new Intent(MainActivity.this,
                        TwoActivity.class));
                finish();
            } else {
                // 10 时间减少
                time--;
                // 11 设置新的时间
                text_time.setText("跳转" + time);
                // 12 创建Message
                Message message = new Message();
                message.what = 0;
                handler.sendMessageDelayed(message, 1000);
            }
            break;

        default:
            break;
        }
    };
};

// 13 创建onDestroy
@Override
protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
    // 14 发送 handler.removeCallbacks(null);
    handler.removeCallbacks(null);
}

}

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