先介绍和handler一起工作的几个组件
Handler的方法介绍
代码示例package liu.peng.weather;import java.util.Timer;import java.util.TimerTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v7.app.ActionBarActivity;import android.widget.ImageView;{[]{R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher};private int currentId = 0;ImageView image;(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);image = (ImageView)findViewById(R.id.image);final Handler myHandler = new Handler(){(Message msg) {if (msg.what == 0x123) {image.setImageResource(imageIds[currentId++%imageIds.length]);}}};new Timer().schedule(new TimerTask() {() {myHandler.sendEmptyMessage(0x123);}}, 0,1200);}}另外一个代码示例package liu.peng.weather;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.os.Handler;import android.os.Looper;import android.os.Message;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.widget.EditText;import android.widget.Toast;{static final String UPPER_NUM = “upper”;EditText edit;CalThread calThread;class CalThread extends Thread{public Handler myHandler;() {Looper.prepare();myHandler = new Handler(){(android.os.Message msg) {if (msg.what == 0x123) {int upper = msg.getData().getInt(UPPER_NUM);List<Integer> nums = new ArrayList<Integer>();outer:for(int i = 2;i<=upper;i++){for(int j = 2;j<=Math.sqrt(i);j++){if (i != 2 && i%j == 0) {continue outer;}}nums.add(i);}Toast.makeText(MainActivity.this, nums.toString(), Toast.LENGTH_LONG).show();}};};Looper.loop();}}(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);edit = (EditText)findViewById(R.id.edit);calThread.start();}(View source){Message msg = new Message();msg.what = 0x123;Bundle bundle = new Bundle();bundle.putInt(UPPER_NUM,Integer.parseInt(edit.getText().toString()));msg.setData(bundle);calThread.myHandler.sendMessage(msg);}}
，走马观花之外，这才是深入体验，探索自我的最佳时间，
