Android拍照得到全尺寸图片并进行压缩

喜欢ヅ旅行 2022-08-20 12:26 184阅读 0赞

`<LinearLayout xmlns:android=` `"http://schemas.android.com/apk/res/android"`

`  ` `android:layout_width=` `"match_parent"`

`  ` `android:layout_height=` `"match_parent"`

`  ` `android:orientation=` `"vertical"` `>`

`  ` `<Button`

`    ` `android:id=` `"@+id/take_photo"`

`    ` `android:layout_width=` `"match_parent"`

`    ` `android:layout_height=` `"wrap_content"`

`    ` `android:text=` `"Take Photo"` `/>`

`  ` `<Button`

`    ` `android:id=` `"@+id/get_photo"`

`    ` `android:layout_width=` `"match_parent"`

`    ` `android:layout_height=` `"wrap_content"`

`    ` `android:text=` `"get Photo"` `/>`

`  ` `<ImageView`

`    ` `android:id=` `"@+id/picture"`

`    ` `android:layout_width=` `"300dp"`

`    ` `android:layout_height=` `"300dp"`

`    ` `android:layout_gravity=` `"center_horizontal"` `/>`

`</LinearLayout>`

`package` `com.example.choosepictest;`

`import` `java.io.File;`

`import` `java.io.IOException;`

`import` `java.text.SimpleDateFormat;`

`import` `java.util.Date;`

`import` `android.app.Activity;`

`import` `android.content.Intent;`

`import` `android.graphics.Bitmap;`

`import` `android.graphics.BitmapFactory;`

`import` `android.net.Uri;`

`import` `android.os.Bundle;`

`import` `android.os.Environment;`

`import` `android.provider.MediaStore;`

`import` `android.view.View;`

`import` `android.view.View.OnClickListener;`

`import` `android.widget.Button;`

`import` `android.widget.ImageView;`

`public` `class` `MainActivity` `extends` `Activity` `implements` `OnClickListener {`

`  ` `static` `final` `int` `REQUEST_IMAGE_CAPTURE =` `1` `;`

`  ` `private` `Button takePhoto;`

`  ` `private` `Button getPhoto;`

`  ` `private` `ImageView picture;`

`  ` `private` `Uri imgUri;`

`  ` `@Override`

`  ` `protected` `void` `onCreate(Bundle savedInstanceState) {`

`    ` `super` `.onCreate(savedInstanceState);`

`    ` `setContentView(R.layout.activity_main);`

`    ` `takePhoto = (Button) findViewById(R.id.take_photo);`

`    ` `getPhoto = (Button) findViewById(R.id.get_photo);`

`    ` `picture = (ImageView) findViewById(R.id.picture);`

`    ` `takePhoto.setOnClickListener(` `this` `);`

`    ` `getPhoto.setOnClickListener(` `this` `);`

`  ` `} `

`  ` `@Override`

`  ` `public` `void` `onClick(View v) {`

`    ` `switch` `(v.getId()) {`

`    ` `case` `R.id.take_photo:`

`      ` `dispatchTakePictureIntent();`

`      ` `break` `;`

`    ` `default` `:`

`      ` `break` `;`

`    ` `}`

`  ` `}`

`  ` `// 保存全尺寸照片`

`  ` `String mCurrentPhotoPath;`

`  ` `private` `void` `dispatchTakePictureIntent() {`

`    ` `File appDir =` `new` `File(Environment.getExternalStorageDirectory(),`

`        ` `"/etoury/picCache"` `);`

`    ` `if` `(!appDir.exists()) {`

`      ` `appDir.mkdir();`

`    ` `}`

`    ` `String timeStamp =` `new` `SimpleDateFormat(` `"yyyyMMdd_HHmmss"` `)`

`        ` `.format(` `new` `Date());`

`    ` `String fileName = timeStamp +` `".jpg"` `;`

`    ` `File outputImage =` `new` `File(appDir, fileName);`

`    ` `try` `{`

`      ` `if` `(outputImage.exists()) {`

`        ` `outputImage.delete();`

`      ` `}`

`      ` `outputImage.createNewFile();`

`    ` `}` `catch` `(IOException e) {`

`      ` `e.printStackTrace();`

`    ` `}`

`    ` `mCurrentPhotoPath = outputImage.getAbsolutePath();`

`    ` `imgUri = Uri.fromFile(outputImage);`

`    ` `// 意图 相机`

`    ` `Intent intent =` `new` `Intent(` `"android.media.action.IMAGE_CAPTURE"` `);`

`    ` `intent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri);`

`    ` `// 如果有相机`

`    ` `if` `(intent.resolveActivity(getPackageManager()) !=` `null` `) {`

`      ` `startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);`

`    ` `}`

`  ` `}`

`  ` `//解码缩放图片(Decode a Scaled Image)`

`  ` `private` `void` `setPic() {`

`    ` `// Get the dimensions of the View`

`    ` `int` `targetW = picture.getWidth();`

`    ` `int` `targetH = picture.getHeight();`

`    ` `// Get the dimensions of the bitmap`

`    ` `BitmapFactory.Options bmOptions =` `new` `BitmapFactory.Options();`

`    ` `// 该 值设为true那么将不返回实际的bitmap，也不给其分配内存空间这样就避免内存溢出了。但是允许我们查询图片的信息这其中就包括图片大小信息`

`    ` `bmOptions.inJustDecodeBounds =` `true` `;`

`    ` `BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);`

`    ` `int` `photoW = bmOptions.outWidth;`

`    ` `int` `photoH = bmOptions.outHeight;`

`    ` `// Determine how much to scale down the image`

`    ` `// Math.min求最小值`

`    ` `int` `scaleFactor = Math.min(photoW/targetW, photoH/targetH);`

`    ` `// Decode the image file into a Bitmap sized to fill the View`

`    ` `bmOptions.inJustDecodeBounds =` `false` `;`

`    ` `// 设置恰当的inSampleSize可以使BitmapFactory分配更少的空间以消除该错误`

`    ` `bmOptions.inSampleSize = scaleFactor;`

`    ` `// 如果inPurgeable设为True的话表示使用BitmapFactory创建的Bitmap,用于存储Pixel的内存空间在系统内存不足时可以被回收`

`    ` `bmOptions.inPurgeable =` `true` `;`

`    ` `Bitmap bitmap = BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);`

`    ` `picture.setImageBitmap(bitmap);`

`  ` `}`

`  ` `@Override`

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

`    ` `if` `(resultCode == RESULT_OK) {`

`      ` `switch` `(requestCode) {`

`      ` `case` `REQUEST_IMAGE_CAPTURE:`

`        ` `setPic();`

`        ` `break` `;`

`      ` `default` `:`

`        ` `break` `;`

`      ` `}`

`    ` `}`

`  ` `}`

`}`

转载地址http://www.jb51.net/article/77223.htm

Android拍照得到全尺寸图片并进行压缩

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