- 效果
详细内容
主要使用MediaProjectionManager和MediaProjection
- 创建保存截图信息的surface
mImageReader = ImageReader.newInstance(UIUtils.getScreenWidth(this),
UIUtils.getScreenHeight(this),
PixelFormat.RGBA_8888,
1);
- 打开系统截屏权限
projectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);
Intent captureIntent = projectionManager.createScreenCaptureIntent();
startActivityForResult(captureIntent, REQUEST_CODE);
- 得到返回数据
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
mediaProjection = projectionManager.getMediaProjection(resultCode, data);
mVirtualDisplay = createVirtualDisplay();
new Thread(new Runnable() {
@Override
public void run() {
//这里需要暂停100ms 否则获取不到Bitmap对象
SystemClock.sleep(100);
getScreenCapture();
runOnUiThread(new Runnable() {
@Override
public void run() {
if (mBitmap != null)
((ImageView) findViewById(R.id.iv_screen)).setImageBitmap(mBitmap);
}
});
}
}).start();
}
}
- 生成的VirtualDisplay实例
/**
* name: 是生成的VirtualDisplay实例的名称;
* width, height: 分别是生成实例的宽高,必须大于0;
* dpi: 生成实例的像素密度,必须大于0,一般都取1;
* surface: 这个比较重要,是你生成的VirtualDisplay的载体,
* 我的理解是,VirtualDisplay的内容是一帧帧的屏幕截图(所以你看到是有宽高,像素密度等设置),
* 所以MediaProjection获取到的其实是一帧帧的图,然后通过 surface(surface你可以理解成是android的一个画布,
* 默认它会以每秒60帧来刷新,这里我们不再展开细说),来顺序播放这些图片,形成视频。
*
* @return
*/
private VirtualDisplay createVirtualDisplay() {
return mediaProjection.createVirtualDisplay("Screen",
UIUtils.getScreenWidth(this), UIUtils.getScreenHeight(this),
UIUtils.getScreenDpi(this),
DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
mImageReader.getSurface(), null /*Callbacks*/, null /*Handler*/);
}
- 获取截图
/**
* 获取截图
*
* @return
*/
private boolean getScreenCapture() {
Image image = mImageReader.acquireLatestImage();
if (image != null) {
int width = image.getWidth();
int height = image.getHeight();
final Image.Plane[] planes = image.getPlanes();
final ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * width;
if (mBitmap == null) {
mBitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
}
mBitmap.copyPixelsFromBuffer(buffer);
image.close();
return true;
}
return false;
}
- 全部代码
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.hardware.display.DisplayManager;
import android.hardware.display.VirtualDisplay;
import android.media.Image;
import android.media.ImageReader;
import android.media.projection.MediaProjection;
import android.media.projection.MediaProjectionManager;
import android.os.Bundle;
import android.os.SystemClock;
import android.widget.ImageView;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.example.webrtcdemo.utils.UIUtils;
import java.nio.ByteBuffer;
/**
* 截屏
*/
public class ScreenPhoneActivity extends AppCompatActivity {
private static final int REQUEST_CODE = 102;
private MediaProjectionManager projectionManager;
private MediaProjection mediaProjection;
private VirtualDisplay mVirtualDisplay;
private ImageReader mImageReader;
private Bitmap mBitmap;
@Override
protected void onDestroy() {
super.onDestroy();
if (mVirtualDisplay == null) {
return;
}
mVirtualDisplay.release();
mVirtualDisplay = null;
if (mediaProjection != null) {
mediaProjection.stop();
mediaProjection = null;
}
mImageReader.close();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cloud_phone);
mImageReader = ImageReader.newInstance(UIUtils.getScreenWidth(this),
UIUtils.getScreenHeight(this),
PixelFormat.RGBA_8888,
1);
projectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);
}
@Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
Intent captureIntent = projectionManager.createScreenCaptureIntent();
startActivityForResult(captureIntent, REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
mediaProjection = projectionManager.getMediaProjection(resultCode, data);
mVirtualDisplay = createVirtualDisplay();
new Thread(new Runnable() {
@Override
public void run() {
//这里需要暂停100ms 否则获取不到Bitmap对象
SystemClock.sleep(100);
getScreenCapture();
runOnUiThread(new Runnable() {
@Override
public void run() {
if (mBitmap != null)
((ImageView) findViewById(R.id.iv_screen)).setImageBitmap(mBitmap);
}
});
}
}).start();
}
}
/**
* name: 是生成的VirtualDisplay实例的名称;
* width, height: 分别是生成实例的宽高,必须大于0;
* dpi: 生成实例的像素密度,必须大于0,一般都取1;
* surface: 这个比较重要,是你生成的VirtualDisplay的载体,
* 我的理解是,VirtualDisplay的内容是一帧帧的屏幕截图(所以你看到是有宽高,像素密度等设置),
* 所以MediaProjection获取到的其实是一帧帧的图,然后通过 surface(surface你可以理解成是android的一个画布,
* 默认它会以每秒60帧来刷新,这里我们不再展开细说),来顺序播放这些图片,形成视频。
*
* @return
*/
private VirtualDisplay createVirtualDisplay() {
return mediaProjection.createVirtualDisplay("Screen",
UIUtils.getScreenWidth(this), UIUtils.getScreenHeight(this),
UIUtils.getScreenDpi(this),
DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
mImageReader.getSurface(), null /*Callbacks*/, null /*Handler*/);
}
/**
* 获取截图
*
* @return
*/
private boolean getScreenCapture() {
Image image = mImageReader.acquireLatestImage();
if (image != null) {
int width = image.getWidth();
int height = image.getHeight();
final Image.Plane[] planes = image.getPlanes();
final ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * width;
if (mBitmap == null) {
mBitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
}
mBitmap.copyPixelsFromBuffer(buffer);
image.close();
return true;
}
return false;
}
}
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />