Android更新UI的五種方式

標籤：

• handler.post
• activity.runOnUiThread
• view.post
• handler+Thread
• AsyncTask

例子：

package com.chao.updateui;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener{    private Layout layout;    private Handler handler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initLayout();        initValue();    }        private void initLayout(){        layout=new Layout();        layout.helloText=(TextView) findViewById(R.id.helloText);        layout.webImg=(ImageView) findViewById(R.id.webImg);        layout.button1=(Button) findViewById(R.id.button1);        layout.button2=(Button) findViewById(R.id.button2);        layout.button3=(Button) findViewById(R.id.button3);        layout.button4=(Button) findViewById(R.id.button4);        layout.button5=(Button) findViewById(R.id.button5);        layout.button1.setOnClickListener(this);        layout.button2.setOnClickListener(this);        layout.button3.setOnClickListener(this);        layout.button4.setOnClickListener(this);        layout.button5.setOnClickListener(this);    }        private void initValue(){        layout.button1.setText("1.Handler.post");        layout.button2.setText("2.activity.runOnUiThread");        layout.button3.setText("3.view.post");        layout.button4.setText("4.handler+Thread");        layout.button5.setText("5.AsyncTask");    }        private class Layout{        TextView helloText;        ImageView webImg;        Button button1;        Button button2;        Button button3;        Button button4;        Button button5;    }    //1.Handler.post    private void method_1(){        new Handler().postDelayed(new Runnable() {                        @Override            public void run() {                layout.helloText.setText("Handler的postDelayed延時一秒");            }        }, 1000);    }    //2.activity.runOnUiThread    private void method_2(){        new Thread(new Runnable() {                        @Override            public void run() {                try {                    Thread.sleep(1000);                    runOnUiThread(new Runnable() {                                                @Override                        public void run() {                            layout.helloText.setText("在子線程中使用activity.runOnUiThread");                        }                    });                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }).start();    }    //3.view.post    private void method_3(){        new Thread(new Runnable() {                        @Override            public void run() {                try {                    Thread.sleep(1000);                    layout.helloText.post(new Runnable() {                                                @Override                        public void run() {                            layout.helloText.setText("在子線程中使用TextView.post");                        }                    });                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }).start();    }    //4.Handler+Thread    private void method_4(){        handler=new Handler(){            @Override            public void handleMessage(Message msg) {                super.handleMessage(msg);                if(msg.what==1){                    Bundle bundle=msg.getData();                    String name=bundle.getString("name");                    String sex=bundle.getString("sex");                    String age=bundle.getString("age");                    layout.helloText.setText(name+"\n"+sex+"\n"+age);                }            }        };        Thread thread=new Thread(new Runnable() {                        @Override            public void run() {                try {                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();                }                Message msg=Message.obtain();                msg.what=1;                                Bundle bundle=new Bundle();                bundle.putString("name", "張三");                bundle.putString("sex", "男");                bundle.putString("age", "16");                msg.setData(bundle);                                handler.sendMessage(msg);            }        });        thread.start();    }    //5.AsyncTask    private void method_5(){                AsyncTask<String, Integer, Bitmap> async=new AsyncTask<String, Integer, Bitmap>(){            @Override            protected Bitmap doInBackground(String... params) {                publishProgress(0);                HttpClient client = new DefaultHttpClient();                HttpGet get = new HttpGet(params[0]);                publishProgress(30);                final Bitmap bitmap;                try {                    HttpResponse response = client.execute(get);                    bitmap = BitmapFactory.decodeStream(response.getEntity()                            .getContent());                } catch (Exception e) {                    return null;                }                publishProgress(100);                return bitmap;            }            @Override            protected void onProgressUpdate(Integer... values) {                super.onProgressUpdate(values);                layout.helloText.setText("進度-"+values[0]+"%");            }            @Override            protected void onPostExecute(Bitmap result) {                super.onPostExecute(result);                if(result==null){                    layout.helloText.setText("擷取圖片失敗");                }else{                    layout.helloText.setText("擷取圖片成功");                    layout.webImg.setImageBitmap(result);                }            }            @Override            protected void onPreExecute() {                layout.webImg.setImageBitmap(null);            }                    };                async.execute("http://imgsize.ph.126.net/?imgurl=http://img2.ph.126.net/-RloZHuMn-ultOW_YDF5fQ==/"                + "6608648723609095427.jpg_96x96x0x90.jpg");            }    @Override    public void onClick(View v) {        switch(v.getId()){        case R.id.button1:            method_1();            break;        case R.id.button2:            method_2();            break;        case R.id.button3:            method_3();            break;        case R.id.button4:            method_4();            break;        case R.id.button5:            method_5();            break;        default:            break;        }    }}

MainActivity.java

 

完整demo：http://pan.baidu.com/s/1eQcUV0Q

Android更新UI的五種方式