public class MainActivity extends Activity {
private ImageView iv;
private Button button;
private File file;
private Uri uri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv = (ImageView) findViewById(R.id.imageView1);
button = (Button) findViewById(R.id.button1);
file = new File(this.getExternalFilesDir(null), "image.jpg");
uri = Uri.fromFile(file);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.Images.Media.ORIENTATION, 0);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent, 2);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
if (requestCode == 2) {
startPhotoZoom(uri);
} else {
try {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
Bitmap bitmap = BitmapFactory.decodeFile(file.getPath(),
options);
// 壓縮圖片
// bitmap = compressImage(bitmap,500);
if (bitmap != null) {
// 顯示圖片
iv.setImageBitmap(bitmap);
// 保存圖片
FileOutputStream fos = null;
fos = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
}
} catch (Exception e) {
// TODO: handle exception
}
}
}
}
/**
* 裁剪圖片
*
* @param uri
*/
public void startPhotoZoom(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");// crop=true 有這句才能出來最后的裁剪頁面.
intent.putExtra("aspectX", 1);// 這兩項為裁剪框的比例.
intent.putExtra("aspectY", 1);// x:y=1:1
intent.putExtra("outputX", 200);//圖片輸出大小
intent.putExtra("outputY", 200);
intent.putExtra("output", uri);
intent.putExtra("outputFormat", "JPEG");// 返回格式
startActivityForResult(intent, 3);
}
/**
* 將圖片image壓縮成大小為 size的圖片(size表示圖片大小侧到,單位是KB)
*
* @param image
* 圖片資源
* @param size
* 圖片大小
* @return Bitmap
*/
private Bitmap compressImage(Bitmap image, int size) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
// 質量壓縮方法扒袖,這里100表示不壓縮,把壓縮后的數(shù)據(jù)存放到baos中
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
int options = 100;
// 循環(huán)判斷如果壓縮后圖片是否大于100kb,大于繼續(xù)壓縮
while (baos.toByteArray().length / 1024 > size) {
// 重置baos即清空baos
baos.reset();
// 每次都減少10
options -= 10;
// 這里壓縮options%,把壓縮后的數(shù)據(jù)存放到baos中
image.compress(Bitmap.CompressFormat.JPEG, options, baos);
}
// 把壓縮后的數(shù)據(jù)baos存放到ByteArrayInputStream中
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
// 把ByteArrayInputStream數(shù)據(jù)生成圖片
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);
return bitmap;
}
}
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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