android 选择本地图片

一、先建第一个activity

 

      1、xml:folder_open.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout   xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical"  android:background="@drawable/white"><Button       android:id="@+id/button"    android:layout_width="fill_parent"      android:layout_height="wrap_content"      android:text=""    />  <TextView  android:id="@+id/fileText"  android:gravity="center"  android:textSize="15dp"  android:textColor="#217ac6"  android:layout_width="fill_parent"      android:layout_height="80dp"      />  <LinearLayout     android:layout_width="fill_parent" android:layout_height="wrap_content"  android:orientation="horizontal">  <TextView   android:textSize="15dp"   android:layout_width="wrap_content"      android:layout_height="wrap_content"android:text="照片描述:"      />      <EditText  android:id="@+id/fileDesc"    android:textSize="15dp"    android:layout_width="fill_parent"      android:layout_height="wrap_content"android:inputType="text"      />     </LinearLayout><Button       android:id="@+id/upload"    android:layout_width="100dp"      android:layout_height="40dp"   android:layout_marginLeft="100dp"   android:text="上传"    />  </LinearLayout>

    2、建立对应的activity： 

public class UploadPicActivity extends Activity{public static final int FILE_RESULT_CODE = 1;private TextView textView;private Button select;private Button upload;private EditText editText;private String filePath;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.folder_open);findViews();select.setText("选择照片");select.setOnClickListener(selector);upload.setOnClickListener(uploader);}private void findViews() {select = (Button)findViewById(R.id.button);textView = (TextView)findViewById(R.id.fileText);upload = (Button)findViewById(R.id.upload);editText = (EditText)findViewById(R.id.fileDesc);}private View.OnClickListener selector = new OnClickListener() {public void onClick(View v) {Intent intent = new Intent(UploadPicActivity.this,FileManager.class);startActivityForResult(intent, FILE_RESULT_CODE);}};private View.OnClickListener uploader = new OnClickListener() {public void onClick(View v) {String fileDesc = editText.getText().toString();//需判断文件是否为照片}};@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {}//消息框private void showDialog(String mess){new AlertDialog.Builder(UploadPicActivity.this).setMessage(mess).setNegativeButton("确定",new DialogInterface.OnClickListener(){     public void onClick(DialogInterface dialog, int which){}}).show();}}

二、建立第二个activity

     1、xml:filelist.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout   xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="250dp"  android:layout_height="400dp"  android:orientation="vertical"  android:background="@drawable/white">  <ListView     android:id="@android:id/list"    android:layout_width="fill_parent"    android:layout_height="250dp"  >  </ListView>    <LinearLayout   android:gravity="center"    android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="horizontal"android:background="@drawable/white"><Button         android:id="@+id/buttonConfirm"      android:layout_width="100dp"        android:layout_height="40dp"    android:layout_marginLeft="10dp"         android:text="确定"      />    <Button         android:id="@+id/buttonCancle"      android:layout_width="100dp"        android:layout_height="40dp"    android:layout_marginLeft="30dp"        android:text="取消"      />  </LinearLayout>  <ImageView        android:id="@+id/imageView"        android:layout_width="fill_parent"       android:layout_height="fill_parent"         android:scaleType="centerInside"        android:contentDescription="@string/pict"/>  </LinearLayout>

2、对应的activity：

public class FileManager extends ListActivity {private List<String> items = null;private List<String> paths = null;private String rootPath = android.os.Environment.getExternalStorageDirectory().getAbsolutePath();//'/mnt/sdcard';//当前文件路径private String curPath = "/";private ImageView image;private Button buttonConfirm;        private MyAdapter adapter;@Overrideprotected void onCreate(Bundle icicle) {super.onCreate(icicle);//设置窗口无标题requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.filelist);findViews();buttonConfirm.setOnClickListener(new OnClickListener() {public void onClick(View v) {Intent data = new Intent(FileManager.this, UploadPicActivity.class);Bundle bundle = new Bundle();bundle.putString("file", curPath);data.putExtras(bundle);setResult(2, data);finish();}});Button buttonCancle = (Button) findViewById(R.id.buttonCancle);buttonCancle.setOnClickListener(new OnClickListener() {public void onClick(View v) {finish();}});getFileDir(rootPath);}private void findViews() {buttonConfirm = (Button) findViewById(R.id.buttonConfirm);image = (ImageView)findViewById(R.id.imageView);}private void getFileDir(String filePath) {items = new ArrayList<String>();paths = new ArrayList<String>();File f = new File(filePath);File[] files = f.listFiles();if (!filePath.equals(rootPath)) {items.add("b1");paths.add(rootPath);items.add("b2");paths.add(f.getParent());}for (int i = 0; i < files.length; i++) {File file = files[i];/*.android_secure 应该文件是个隐藏文件，我每次点击就出错，干脆直接不显示了*/if((rootPath+"/.android_secure").equals(file.getPath())){continue;}items.add(file.getName());paths.add(file.getPath());}                adapter = new MyAdapter(this, items, paths);setListAdapter(adapter);}private int save = -1;@Overrideprotected void onListItemClick(ListView parent, View v, int position, long id) {/*设置选中的文件高亮显示if(parent != null && parent.getChildAt(position) != null){parent.getChildAt(position).setBackgroundColor(Color.CYAN);}try{if(save != -1 && save != position){//报异常parent.getChildAt(save).setBackgroundColor(Color.WHITE);}}catch (Exception e) {Log.e("NULL", e.toString());//这边一直报空值。}                */File file = new File(paths.get(position));if (file.isDirectory()) {curPath = paths.get(position);getFileDir(paths.get(position));} else {curPath = paths.get(position);                        //刷新界面，高亮显示adapter = new MyAdapter(this, items, paths);setListAdapter(adapter);}//将选中的图片显示String filename = file.getName();if(filename != null && filename.endsWith(".bmp") || filename.endsWith(".gif") || filename.endsWith(".jpg")|| filename.endsWith(".jpeg") || filename.endsWith(".png")){Bitmap bitmap = getLoacalBitmap(file.getPath());if(bitmap != null){image.setImageBitmap(bitmap);}bitmap = null;}save = position;}//根据图片URL返回Bitmapprivate Bitmap getLoacalBitmap(String url) {     try {          FileInputStream fis = new FileInputStream(url);          return Bitmap.createBitmap(BitmapFactory.decodeStream(fis));     } catch (FileNotFoundException e){          e.printStackTrace();          return null;     }}}

三、创建Adapter

     1、xml：filerow.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="horizontal"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:background="#ffffff"    >   <ImageView android:id="@+id/icon"    android:layout_width="30dip"    android:layout_height="30dip"/>    <TextView android:id="@+id/text"    android:layout_gravity="center_horizontal"    android:layout_width="fill_parent"    android:layout_height="wrap_content"     android:textColor="@drawable/darkgray"/>  </LinearLayout>

   2、创建Adapter：MyAdapter

public class MyAdapter extends BaseAdapter{  private LayoutInflater mInflater;  private Bitmap mIcon1;  private Bitmap mIcon2;  private Bitmap mIcon3;  private Bitmap mIcon4;  private List<String> items;  private List<String> paths;  private int position = -1;  public MyAdapter(Context context,List<String> it,List<String> pa){      mInflater = LayoutInflater.from(context);    items = it;    paths = pa;    mIcon1 = BitmapFactory.decodeResource(context.getResources(),R.drawable.back01);//返回根目录    mIcon2 = BitmapFactory.decodeResource(context.getResources(),R.drawable.back02);//返回上一目录    mIcon3 = BitmapFactory.decodeResource(context.getResources(),R.drawable.folder);//目录    mIcon4 = BitmapFactory.decodeResource(context.getResources(),R.drawable.doc);//文件  }  public void setSelectItem(int position){    this.position = position;  }  @Override  public int getCount(){      return items.size();  }  @Override  public Object getItem(int position){    return items.get(position);  }    @Override()  public long getItemId(int position){    return position;  }    @Override  public View getView(int position,View convertView,ViewGroup parent){      ViewHolder holder;        if(convertView == null){      convertView = mInflater.inflate(R.layout.filerow, null);      holder = new ViewHolder();      holder.text = (TextView) convertView.findViewById(R.id.text);      holder.icon = (ImageView) convertView.findViewById(R.id.icon);            convertView.setTag(holder);    }    else{      holder = (ViewHolder) convertView.getTag();    }    File f = new File(paths.get(position).toString());    if(items.get(position).toString().equals("b1")){      holder.text.setText("返回根目录..");      holder.icon.setImageBitmap(mIcon1);    }    else if(items.get(position).toString().equals("b2")){      holder.text.setText("返回上一层..");      holder.icon.setImageBitmap(mIcon2);    }    else{      holder.text.setText(f.getName());      if(f.isDirectory()){        holder.icon.setImageBitmap(mIcon3);      }      else{        holder.icon.setImageBitmap(mIcon4);      }    }    //设置选中文件的颜色    if (this.position == position) {      convertView.setBackgroundColor(Color.LTGRAY);      }       else {      convertView.setBackgroundColor(Color.TRANSPARENT);      }          return convertView;  }  private class ViewHolder{    TextView text;    ImageView icon;  }}