我有一个应用程序，它截取屏幕截图并保存它们正常工作。但是，现在当我去查看屏幕截图时，它既有黑色背景，也只是显示黑屏。如何返回我的应用程序的实际屏幕截图？
MainActivity
public class ScreenshotActivity extends Activity {
Button btn_screenshoot;
int i = 0;
ImageView imgv_showscreenshot;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.screenshotlayout);
btn_screenshoot = (Button) findViewById(R.id.btn_screenshoot);
btn_screenshoot.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Environment.getExternalStorageDirectory())));
View view = findViewById(R.id.relativelayout);
view.setDrawingCacheEnabled(true);
Bitmap bitmap = view.getDrawingCache();
BitmapDrawable bitmapDrawable = new BitmapDrawable(bitmap);
imgv_showscreenshot = (ImageView) findViewById(R.id.imgv_showscreenshot);
// set screenshot bitmapdrawable to imageview
imgv_showscreenshot.setBackgroundDrawable(bitmapDrawable);
if (Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState())) {
// we check if external storage is available, otherwise
// display an error message to the user using Toast Message
File sdCard = Environment.getExternalStorageDirectory();
File directory = new File(sdCard.getAbsolutePath()
+ "/DCIM/Images");
directory.mkdirs();
String filename = "screenshot" + i + ".jpg";
File yourFile = new File(directory, filename);
while (yourFile.exists()) {
i++;
filename = "screenshot" + i + ".jpg";
yourFile = new File(directory, filename);
}
if (!yourFile.exists()) {
if (directory.canWrite()) {
try {
FileOutputStream out = new FileOutputStream(
yourFile, true);
bitmap.compress(Bitmap.CompressFormat.PNG, 90,
out);
out.flush();
out.close();
Toast.makeText(
ScreenshotActivity.this,
"File exported to: " + yourFile.getAbsolutePath()+ i + ".jpg",
Toast.LENGTH_SHORT).show();
i++;
} catch (IOException e) {
e.printStackTrace();
}
}
}
} else {
Toast.makeText(ScreenshotActivity.this,
"Sorry SD Card not available in your Device!",
Toast.LENGTH_SHORT).show();
}
}
});
}
}
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/relativelayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="@+id/btn_screenshoot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:text="Capture" />
<ImageView
android:id="@+id/imgv_showscreenshot"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_below="@+id/btn_screenshoot"
android:layout_marginTop="10dp" />
</RelativeLayout>
Android Manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidsurya.screenshot"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.androidsurya.screenshot.ScreenshotActivity"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<intent-filter>
<action android:name="android.intent.action.MEDIA_MOUNTED" />
<data android:scheme="file" />
</intent-filter>
</application>
</manifest>
答案 0 :(得分：0)
检查您的手机是否已植根。如果您的手机已植根，请尝试使用
进程sh = Runtime.getRuntime（）。exec（＆＃34; su＆＃34;，null，null）;
OutputStream os = sh.getOutputStream();
os.write(("/system/bin/screencap -p " + "/sdcard/img.png").getBytes("ASCII"));
os.flush();
os.close();
sh.waitFor();
然后将img.png作为位图读取并将其转换为jpg如下
Bitmap screen = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+File.separator +"img.png");
//my code for saving
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
screen.compress(Bitmap.CompressFormat.JPEG, 15, bytes);
//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()+ File.separator + "test.jpg");
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
// remember close de FileOutput
fo.close();
如果您的应用程序处于后台，除非您扎根，否则您无权访问该屏幕，即使您在后台，上面的代码也可以最有效地截取屏幕截图。
更新
谷歌有一个图书馆，你可以用它来截取而不需要生根，我试过了，但我确信它会尽快消耗内存。