Handler的两种用法

来源：互联网发布：什么叫不支持网络打印编辑：程序博客网时间：2024/06/11 21:10

Android为了线程安全,只允许在主线程中修改UI,如果想在子线程中更改UI,可以使用Handler.

用法一:

 //在子线程中发送更新信息 Message msg = Message.obtain(); msg.what = 1; Bundle data = new Bundle(); data.putString("sourceStr", result); data.putString("targetStr", result); msg.setData(data); handler.sendMessage(msg);

//在主线程中处理信息handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == 1) { strTV.setText(msg.getData().getString("sourceStr")); showTV.setText(msg.getData().getString("targetStr")); } } };

用法二:在子线程中直接处理UI信息

new Handler(Looper.getMainLooper()).post(new Runnable() {@Overridepublic void run() {JSONObject object = (JSONObject) ((Object) tempStr);SrcID srcID = (SrcID) object.opt("result");showTV.setText(srcID.getArea());}});

1 0