如何通过代码而不是程序来截取手机屏幕的选定区域的截图?
当前回答
只是扩展塔拉洛卡的答案。您必须添加以下行才能使其工作。我已将映像名称设置为静态。请确保您使用taraloca的时间戳变量,以防您需要动态图像名称。
// Storage Permissions
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
private void verifyStoragePermissions() {
// Check if we have write permission
int permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permission != PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);
}else{
takeScreenshot();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (requestCode == REQUEST_EXTERNAL_STORAGE) {
takeScreenshot();
}
}
}
在AndroidManifest.xml文件中,以下条目是必须的:
< uses-permission android: name = " android.permission。READ_EXTERNAL_STORAGE " / > < uses-permission android: name = " android.permission。WRITE_EXTERNAL_STORAGE " / >
其他回答
只是扩展塔拉洛卡的答案。您必须添加以下行才能使其工作。我已将映像名称设置为静态。请确保您使用taraloca的时间戳变量,以防您需要动态图像名称。
// Storage Permissions
private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
private void verifyStoragePermissions() {
// Check if we have write permission
int permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permission != PackageManager.PERMISSION_GRANTED) {
// We don't have permission so prompt the user
ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);
}else{
takeScreenshot();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (requestCode == REQUEST_EXTERNAL_STORAGE) {
takeScreenshot();
}
}
}
在AndroidManifest.xml文件中,以下条目是必须的:
< uses-permission android: name = " android.permission。READ_EXTERNAL_STORAGE " / > < uses-permission android: name = " android.permission。WRITE_EXTERNAL_STORAGE " / >
public class ScreenShotActivity extends Activity{
private RelativeLayout relativeLayout;
private Bitmap myBitmap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
relativeLayout = (RelativeLayout)findViewById(R.id.relative1);
relativeLayout.post(new Runnable() {
public void run() {
//take screenshot
myBitmap = captureScreen(relativeLayout);
Toast.makeText(getApplicationContext(), "Screenshot captured..!", Toast.LENGTH_LONG).show();
try {
if(myBitmap!=null){
//save image to SD card
saveImage(myBitmap);
}
Toast.makeText(getApplicationContext(), "Screenshot saved..!", Toast.LENGTH_LONG).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
public static Bitmap captureScreen(View v) {
Bitmap screenshot = null;
try {
if(v!=null) {
screenshot = Bitmap.createBitmap(v.getMeasuredWidth(),v.getMeasuredHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(screenshot);
v.draw(canvas);
}
}catch (Exception e){
Log.d("ScreenShotActivity", "Failed to capture screenshot because:" + e.getMessage());
}
return screenshot;
}
public static void saveImage(Bitmap bitmap) throws IOException{
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 40, bytes);
File f = new File(Environment.getExternalStorageDirectory() + File.separator + "test.png");
f.createNewFile();
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.close();
}
}
添加权限
< uses-permission android: name = " android.permission.WRITE_EXTERNAL_STORAGE " / >
这个方法不需要root权限,也不需要大量编码。
在adb shell上使用以下命令可以截屏。
input keyevent 120
这个命令不需要任何root权限,所以你也可以从android应用程序的java代码执行。
Process process;
process = Runtime.getRuntime().exec("input keyevent 120");
更多关于android中的keyevent代码,请参阅http://developer.android.com/reference/android/view/KeyEvent.html
这里我们用了。KEYCODE_SYSRQ,它的值是120,用于系统请求/打印屏幕键。
如CJBS所说,输出的图片将保存在/sdcard/Pictures/Screenshots
注:仅适用于root phone
编程方式:adb shell /system/bin/screencap -p /sdcard/img.png
Process sh = Runtime.getRuntime().exec("su", 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读取为位图,并按照您的意愿使用。
调用这个方法,传入你想要屏幕截图的最外层ViewGroup:
public Bitmap screenShot(View view) {
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(),
view.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
return bitmap;
}
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