android--调用系统相机，显示图片

public class ImageDemoActivity extends Activity {

/** Called when the activity is first created. */

private ImageView imageView; // 图片

private Button button; // 按钮

Bitmap myBitmap;

private byte[] mContent;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

imageView = (ImageView) findViewById(R.id.imageView1);

button = (Button) findViewById(R.id.button1);

button.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

/*

* // TODO Auto-generated method stub Intent intent = new

* Intent("android.media.action.IMAGE_CAPTURE");

* startActivityForResult(intent,Activity.DEFAULT_KEYS_DIALER);

*/

final AlertDialog.Builder builder = new AlertDialog.Builder(

ImageDemoActivity.this);

builder.setTitle("选择照片");

builder.setPositiveButton("相机",

new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface

dialog, int which) {

Intent intent = new Intent(

"android.media.action.IMAGE_CAPTURE");

startActivityForResult(intent, 0);

}

});

builder.setNegativeButton("相册",

new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface

dialog, int which) {

Intent intent = new Intent(

Intent.ACTION_PICK,

android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

startActivityForResult(intent, 1);

}

});

AlertDialog alert = builder.create();

alert.show();

}

});

}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

ContentResolver resolver = getContentResolver();

/**

* 如果不拍照 或者不选择图片返回 不执行任何操作

*/

if (data != null) {

/**

* 因为两种方式都用到了startActivityForResult方法，这个方法执行完后都会执行onActivityResult方法

* ， 所以为了区别到底选择了那个方式获取图片要进行判断

* ，这里的requestCode跟startActivityForResult里面第二个参数对应 1== 相册 2 ==相机

*/

if (requestCode == 1) {

try {

// 获得图片的uri

Uri originalUri = data.getData();

// 将图片内容解析成字节数组

mContent = readStream(resolver.openInputStream(Uri

.parse(originalUri.toString())));

// 将字节数组转换为ImageView可调用的Bitmap对象

myBitmap = getPicFromBytes(mContent, null);

// //把得到的图片绑定在控件上显示

imageView.setImageBitmap(myBitmap);

} catch (Exception e) {

System.out.println(e.getMessage());

}

} else if (requestCode == 0) {

String sdStatus = Environment.getExternalStorageState();

if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用

return;

}

Bundle bundle = data.getExtras();

Bitmap bitmap = (Bitmap) bundle.get("data");// 获取相机返回的数据，并转换为Bitmap图片格式

FileOutputStream b = null;

File file = new File("/sdcard/myImage/");

file.mkdirs();// 创建文件夹，名称为myimage

// 照片的命名，目标文件夹下，以当前时间数字串为名称，即可确保每张照片名称不相同。

String str = null;

Date date = null;

SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");// 获取当前时间，进一步转化为字符串

date = new Date();

str = format.format(date);

String fileName = "/sdcard/myImage/" + str + ".jpg";

try {

b = new FileOutputStream(fileName);

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件

} catch (FileNotFoundException e) {

e.printStackTrace();

} finally {

try {

b.flush();

b.close();

} catch (IOException e) {

e.printStackTrace();

}

if (data != null) {

Bitmap cameraBitmap = (Bitmap) data.getExtras().get(

"data");

System.out.println("fdf================="

+ data.getDataString());

imageView.setImageBitmap(cameraBitmap);

System.out.println("成功======" + cameraBitmap.getWidth()

+ cameraBitmap.getHeight());

}

}

}

}

}

public static Bitmap getPicFromBytes(byte[] bytes,

BitmapFactory.Options opts) {

if (bytes != null)

if (opts != null)

return BitmapFactory.decodeByteArray(bytes, 0, bytes.length,

opts);

else

return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

return null;

}

public static byte[] readStream(InputStream inStream) throws Exception {

byte[] buffer = new byte[1024];

int len = -1;

ByteArrayOutputStream outStream = new ByteArrayOutputStream();

while ((len = inStream.read(buffer)) != -1) {

outStream.write(buffer, 0, len);

}

byte[] data = outStream.toByteArray();

outStream.close();

inStream.close();

return data;

}

}