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;
}
}