在安卓中新建一个线程,一般我们会在遇到耗时的操作的时候,将耗时的操作放到新开辟的线程当中,然后将产生的数据传到主线的时候就要用到Handler来处理了,handler使用Message来传递通信,然后将值传过去。
public class MainActivity extends Activity {
Button btn;
int j;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity);
btn = (Button) findViewById(R.id.btn);
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what == 1) {
System.out.println("输出--j--"+msg.arg1);
}
}
};
final Thread t=new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
for(int i=0;i<9;i++){
Message msg=new Message();
j=i;
msg.what=1;
msg.arg1=j;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
handler.sendMessage(msg);
}
}
});
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
t.start();
}
});
}
}
输出的值为: