在实际应用中,经常需要对图片进行处理,包括压缩、截图等等,其实android系统提供了一个可以截图的activity,我们只需调用它就行了,下面示例完成一个通过相机照相或相册选取图片后对其截图的功能,其实知道图片的路劲都可以调用截图activity,代码如下:
测试activity:
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import
java.io.File;
import
android.app.Activity;
import
android.content.Intent;
import
android.graphics.Bitmap;
import
android.graphics.drawable.BitmapDrawable;
import
android.net.Uri;
import
android.os.Bundle;
import
android.os.Environment;
import
android.provider.MediaStore;
import
android.provider.MediaStore.Images.Media;
import
android.view.View;
import
android.view.View.OnClickListener;
import
android.widget.Button;
import
android.widget.ImageView;
import
android.widget.Toast;
public
class
TestClipImageActivity extends
Activity implements
OnClickListener {
private
Button gallaryBtn;
private
Button cameraBtn;
private
ImageView showImage;
private
File file;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gallaryBtn
= (Button) findViewById(R.id.main_btn_gallery);
cameraBtn
= (Button) findViewById(R.id.main_btn_camera);
gallaryBtn.setOnClickListener(this);
cameraBtn.setOnClickListener(this);
showImage
= (ImageView) findViewById(R.id.main_image);
}
@Override
public
void
onClick(View v) {
if
(v == gallaryBtn) {
//
跳转至相册界面
Intent
intent = new
Intent(Intent.ACTION_PICK,
Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 0);
}
if
(v == cameraBtn) {
if
(!Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState()))
{
Toast.makeText(this, "请插入SD卡",
Toast.LENGTH_SHORT).show();
return;
}
//
跳转至相机界面
Intent
intent = new
Intent(MediaStore.ACTION_IMAGE_CAPTURE);
file
= new
File(Environment.getExternalStorageDirectory(),
getPhotoName());
//
指定相机拍照后相片的存储位置
intent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(file));
startActivityForResult(intent, 1);
}
}
@Override
protected
void
onActivityResult(int
requestCode, int
resultCode, Intent data) {
super.onActivityResult(requestCode,
resultCode, data);
//
系统相册返回
if
(requestCode == 0
&& resultCode == Activity.RESULT_OK
&&
data != null)
{
startPhotoZoom(data.getData(), 150);//
截图
}
//
系统相机返回
if
(requestCode == 1
&& resultCode == Activity.RESULT_OK) {
startPhotoZoom(Uri.fromFile(file), 150);//
截图
}
//
截图后返回
if
(requestCode == 2
&& data != null)
{
Bundle
bundle = data.getExtras();
if
(bundle != null)
{
Bitmap
bitmap = bundle.getParcelable("data");
showImage.setBackgroundDrawable(new
BitmapDrawable(bitmap));
}
}
}
/**
*
跳转至系统截图界面进行截图
*
*
@param data
*
@param size
*/
private
void
startPhotoZoom(Uri data, int
size) {
Intent
intent = new
Intent("com.android.camera.action.CROP");
intent.setDataAndType(data, "image/*");
//
crop为true时表示显示的view可以剪裁
intent.putExtra("crop", "true");
//
aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
//
outputX,outputY 是剪裁图片的宽高
intent.putExtra("outputX",
size);
intent.putExtra("outputY",
size);
intent.putExtra("return-data", true);
startActivityForResult(intent, 2);
}
/**
*
产生照片名称
*
*
@return
*/
private
String getPhotoName() {
String
name = System.currentTimeMillis() + ".jpg";
return
name;
}
}
布局文件:
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<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="horizontal"
>
<Button
android:id="@+id/main_btn_gallery"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="相册"
/>
<Button
android:id="@+id/main_btn_camera"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="相机"
/>
</LinearLayout>
<ImageView
android:id="@+id/main_image"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_gravity="center_horizontal"
android:layout_marginTop="30dp"
/>
</LinearLayout>
加上权限:
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<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission
android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>