MainActivity如下:
package cn.testphotocrop;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
/**
* Demo描述:
* 1 从系统图片库中选取照片进行显示
* 2 从系统图片库中选取照片进行剪切然后显示
*
* 延伸阅读:
* 自定义图片剪裁
* http://blog.csdn.net/liuhanhan512/article/details/8308525
*/
public class MainActivity extends Activity {
private Button mSelectButton;
private Button mCropButton;
private ImageView mImageView;
private final int SELECT_PHOTO=9527;
private final int CROP_PHOTO=7;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
mSelectButton=(Button) findViewById(R.id.selectorButton);
mSelectButton.setOnClickListener(new ClickListenerImpl());
mCropButton=(Button) findViewById(R.id.cropButton);
mCropButton.setOnClickListener(new ClickListenerImpl());
mImageView=(ImageView) findViewById(R.id.imageView);
}
private class ClickListenerImpl implements OnClickListener{
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.selectorButton:
Intent intent_select =
new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent_select, SELECT_PHOTO);
break;
case R.id.cropButton:
Intent intent_crop = getImageCropIntent();
startActivityForResult(intent_crop, CROP_PHOTO);
break;
default:
break;
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==SELECT_PHOTO) {
try {
Uri imageUri=data.getData();
Bitmap bitmap=BitmapFactory.decodeStream
(getContentResolver().openInputStream(imageUri), null, null);
mImageView.setImageBitmap(bitmap);
} catch (Exception e) {
}
}
if (requestCode==CROP_PHOTO) {
//注意：
//此处getParcelableExtra("data")中的"data"标签应该与
//getImageCropIntent()方法中的 intent.putExtra("return-data", true)处
//"return-data"里的"data"保持一致
Bitmap bitmap = data.getParcelableExtra("data");
mImageView.setImageBitmap(bitmap);
}
}
private Intent getImageCropIntent() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", 80);
intent.putExtra("outputY", 80);
intent.putExtra("return-data", true);
return intent;
}
}
main.xml如下:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button
android:id="@+id/selectorButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="选择照片"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dip"
/>
<Button
android:id="@+id/cropButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="剪裁照片"
android:layout_centerHorizontal="true"
android:layout_marginTop="80dip"
/>
<ImageView
android:id="@+id/imageView"
android:layout_below="@id/cropButton"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</RelativeLayout>
