Test

1 publicclass TestActivity extends Activity {    privatefinalstatic String TAG = "IcsTestActivity";    privatefinalstatic String ALBUM_PATH            = Environment.getExternalStorageDirectory() + "/download_test/";    private ImageView mImageView;    private Button mBtnSave;    private ProgressDialog mSaveDialog = null;    private Bitmap mBitmap;    private String mFileName;    private String mSaveMessage;
2
3
4    @Override    protectedvoid onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);
5        setContentView(R.layout.main);
6
7        mImageView = (ImageView)findViewById(R.id.imgSource);
8        mBtnSave = (Button)findViewById(R.id.btnSave);        new Thread(connectNet).start();        // 下载图片
9        mBtnSave.setOnClickListener(new Button.OnClickListener(){            publicvoid onClick(View v) {
10                mSaveDialog = ProgressDialog.show(IcsTestActivity.this, "保存图片", "图片正在保存中，请稍等...", true);                new Thread(saveFileRunnable).start();
11        }
12        });
13    }    /**
14     * Get image from newwork
15     * @param path The path of image
16     * @return byte[]
17     * @throws Exception     */publicbyte[] getImage(String path) throws Exception{
18        URL url = new URL(path);
19        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
20        conn.setConnectTimeout(5 * 1000);
21        conn.setRequestMethod("GET");
22        InputStream inStream = conn.getInputStream();        if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){            return readStream(inStream);
23        }        returnnull;
24    }    /**
25     * Get image from newwork
26     * @param path The path of image
27     * @return InputStream
28     * @throws Exception     */public InputStream getImageStream(String path) throws Exception{
29        URL url = new URL(path);
30        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
31        conn.setConnectTimeout(5 * 1000);
32        conn.setRequestMethod("GET");        if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){            return conn.getInputStream();
33        }        returnnull;
34    }    /**
35     * Get data from stream
36     * @param inStream
37     * @return byte[]
38     * @throws Exception     */publicstaticbyte[] readStream(InputStream inStream) throws Exception{
39        ByteArrayOutputStream outStream = new ByteArrayOutputStream();        byte[] buffer = newbyte[1024];        int len = 0;        while( (len=inStream.read(buffer)) != -1){
40            outStream.write(buffer, 0, len);
41        }
42        outStream.close();
43        inStream.close();        return outStream.toByteArray();
44    }    /**
45     * 保存文件
46     * @param bm
47     * @param fileName
48     * @throws IOException     */publicvoid saveFile(Bitmap bm, String fileName) throws IOException {
49        File dirFile = new File(ALBUM_PATH);        if(!dirFile.exists()){
50            dirFile.mkdir();
51        }
52        File myCaptureFile = new File(ALBUM_PATH + fileName);
53        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
54        bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
55        bos.flush();
56        bos.close();
57    }    private Runnable saveFileRunnable = new Runnable(){
58        @Override        publicvoid run() {            try {
59                saveFile(mBitmap, mFileName);
60                mSaveMessage = "图片保存成功！";
61            } catch (IOException e) {
62                mSaveMessage = "图片保存失败！";
63                e.printStackTrace();
64            }
65            messageHandler.sendMessage(messageHandler.obtainMessage());
66        }
67
68    };    private Handler messageHandler = new Handler() {
69        @Override        publicvoid handleMessage(Message msg) {
70            mSaveDialog.dismiss();
71            Log.d(TAG, mSaveMessage);
72            Toast.makeText(IcsTestActivity.this, mSaveMessage, Toast.LENGTH_SHORT).show();
73        }
74    };    /*
75     * 连接网络
76     * 由于在4.0中不允许在主线程中访问网络，所以需要在子线程中访问     */private Runnable connectNet = new Runnable(){
77        @Override        publicvoid run() {            try {
78                String filePath = "http://img.my.csdn.net/uploads/201211/21/1353511891_4579.jpg";
79                mFileName = "test.jpg";                //以下是取得图片的两种方法//////////////// 方法1：取得的是byte数组, 从byte数组生成bitmapbyte[] data = getImage(filePath);                if(data!=null){
80                    mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// bitmap
81                }else{
82                    Toast.makeText(IcsTestActivity.this, "Image error!", 1).show();
83                }                //////////////////////////////////////////////////////////******** 方法2：取得的是InputStream，直接从InputStream生成bitmap ***********/
84                mBitmap = BitmapFactory.decodeStream(getImageStream(filePath));                //********************************************************************/                // 发送消息，通知handler在主线程中更新UI
85                connectHanlder.sendEmptyMessage(0);
86                Log.d(TAG, "set image ...");
87            } catch (Exception e) {
88                Toast.makeText(IcsTestActivity.this,"无法链接网络！", 1).show();
89                e.printStackTrace();
90            }
91
92        }
93
94    };    private Handler connectHanlder = new Handler() {
95        @Override        publicvoid handleMessage(Message msg) {
96            Log.d(TAG, "display image");            // 更新UI，显示图片if (mBitmap != null) {
97                mImageView.setImageBitmap(mBitmap);// display image            }
98        }
99    };
100
101}
102
103<?xml version="1.0" encoding="utf-8"?>
104<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
105    android:orientation="vertical"
106    android:layout_width="fill_parent"
107    android:layout_height="fill_parent">
108<Button        android:id="@+id/btnSave"
109          android:layout_width="wrap_content" 
110        android:layout_height="wrap_content"
111        android:text="保存图片"/>
112<ImageView        android:id="@+id/imgSource"
113          android:layout_width="wrap_content" 
114        android:layout_height="wrap_content" 
115        android:adjustViewBounds="true"/></LinearLayout>