线程更新UI

来源：互联网发布：java 模拟get请求编辑：程序博客网时间：2024/06/05 18:51
更新UI方式：

更新UI方法一：handler.post
更新UI方法二：view.post
更新UI方法三：runOnUiThread
更新UI方法四：handler.handleMessage
示例：

public class ThreadActivity extends FragmentActivity {    /*更新UI方法四：handler.handleMessage*/    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case 0:                    Log.e("111", "开始下载");                    break;                case 1:                    Log.e("111", "设置图片");                    mIv.setImageBitmap((Bitmap) msg.obj);                    Log.e("111", "handler.handleMessage为：" + Looper.getMainLooper().getThread());//Thread[main,5,main]                    Log.e("111", "handler.handleMessage 名称为：" + Thread.currentThread().getName());//main                    break;                case 2:                    Log.e("111", "设置完毕");                    break;            }        }    };    private ImageView mIv;    private String path = "https://github.com/Ablexq/MyTabs/raw/master/pic/a.jpg";    @RequiresApi(api = Build.VERSION_CODES.KITKAT)    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_thread);        mIv = ((ImageView) this.findViewById(R.id.iv));        Log.e("111", "主线程（UI线程）为：" + Looper.getMainLooper().getThread());//Thread[main,5,main]        Log.e("111", "主线程（UI线程）名称为：" + Thread.currentThread().getName());//main        new Thread(new Runnable() {//子线程            @Override            public void run() {                //下载前                handler.sendEmptyMessage(0);                Bitmap bm = null;                try {                    HttpURLConnection huc = (HttpURLConnection) new URL(path).openConnection();                    huc.connect();                    if (huc.getResponseCode() == 200) {                        bm = BitmapFactory.decodeStream(huc.getInputStream());                    }                    //设置图片                    Message message = Message.obtain();                    message.obj = bm;                    message.what = 1;                    handler.sendMessage(message);                    //设置图片后                    handler.sendEmptyMessage(2);                } catch (IOException e) {                    e.printStackTrace();                }                Log.e("111", "new Thread线程为：" + Thread.currentThread());//Thread[Thread-5,5,main]                Log.e("111", "new Thread线程 名称为：" + Thread.currentThread().getName());//Thread-5                final Bitmap finalBm = bm;                /*更新UI方法一：handler.post*///                handler.post(new Runnable() {//                    @Override//                    public void run() {//                        Log.e("111", "handler.post线程为：" + Thread.currentThread());//Thread[main,5,main]//                        Log.e("111", "handler.post线程 名称为：" + Thread.currentThread().getName());//main//                        mIv.setImageBitmap(finalBm);//                    }//                });                /*更新UI方法二：view.post*///                mIv.post(new Runnable() {//                    @Override//                    public void run() {//                        Log.e("111", "view.post线程为：" + Thread.currentThread());//Thread[main,5,main]//                        Log.e("111", "view.post线程 名称为：" + Thread.currentThread().getName());//main//                        mIv.setImageBitmap(finalBm);//                    }//                });                /*更新UI方法三：runOnUiThread*///                runOnUiThread(new Runnable() {//                    @Override//                    public void run() {//                        Log.e("111", "runOnUiThread线程为：" + Thread.currentThread());//Thread[main,5,main]//                        Log.e("111", "runOnUiThread线程 名称为：" + Thread.currentThread().getName());//main////                        mIv.setImageBitmap(finalBm);//                    }//                });            }        }).start();    }}
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