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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.screencapture;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.hardware.display.DisplayManager;
     23 import android.hardware.display.VirtualDisplay;
     24 import android.media.projection.MediaProjection;
     25 import android.media.projection.MediaProjectionManager;
     26 import android.os.Bundle;
     27 import android.support.annotation.Nullable;
     28 import android.support.v4.app.Fragment;
     29 import android.util.DisplayMetrics;
     30 import android.view.LayoutInflater;
     31 import android.view.Surface;
     32 import android.view.SurfaceView;
     33 import android.view.View;
     34 import android.view.ViewGroup;
     35 import android.widget.Button;
     36 import android.widget.Toast;
     37 
     38 import com.example.android.common.logger.Log;
     39 
     40 /**
     41  * Provides UI for the screen capture.
     42  */
     43 public class ScreenCaptureFragment extends Fragment implements View.OnClickListener {
     44 
     45     private static final String TAG = "ScreenCaptureFragment";
     46 
     47     private static final String STATE_RESULT_CODE = "result_code";
     48     private static final String STATE_RESULT_DATA = "result_data";
     49 
     50     private static final int REQUEST_MEDIA_PROJECTION = 1;
     51 
     52     private int mScreenDensity;
     53 
     54     private int mResultCode;
     55     private Intent mResultData;
     56 
     57     private Surface mSurface;
     58     private MediaProjection mMediaProjection;
     59     private VirtualDisplay mVirtualDisplay;
     60     private MediaProjectionManager mMediaProjectionManager;
     61     private Button mButtonToggle;
     62     private SurfaceView mSurfaceView;
     63 
     64     @Override
     65     public void onCreate(Bundle savedInstanceState) {
     66         super.onCreate(savedInstanceState);
     67         if (savedInstanceState != null) {
     68             mResultCode = savedInstanceState.getInt(STATE_RESULT_CODE);
     69             mResultData = savedInstanceState.getParcelable(STATE_RESULT_DATA);
     70         }
     71     }
     72 
     73     @Nullable
     74     @Override
     75     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
     76         return inflater.inflate(R.layout.fragment_screen_capture, container, false);
     77     }
     78 
     79     @Override
     80     public void onViewCreated(View view, Bundle savedInstanceState) {
     81         mSurfaceView = (SurfaceView) view.findViewById(R.id.surface);
     82         mSurface = mSurfaceView.getHolder().getSurface();
     83         mButtonToggle = (Button) view.findViewById(R.id.toggle);
     84         mButtonToggle.setOnClickListener(this);
     85     }
     86 
     87     @Override
     88     public void onActivityCreated(Bundle savedInstanceState) {
     89         super.onActivityCreated(savedInstanceState);
     90         Activity activity = getActivity();
     91         DisplayMetrics metrics = new DisplayMetrics();
     92         activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
     93         mScreenDensity = metrics.densityDpi;
     94         mMediaProjectionManager = (MediaProjectionManager)
     95                 activity.getSystemService(Context.MEDIA_PROJECTION_SERVICE);
     96     }
     97 
     98     @Override
     99     public void onSaveInstanceState(Bundle outState) {
    100         super.onSaveInstanceState(outState);
    101         if (mResultData != null) {
    102             outState.putInt(STATE_RESULT_CODE, mResultCode);
    103             outState.putParcelable(STATE_RESULT_DATA, mResultData);
    104         }
    105     }
    106 
    107     @Override
    108     public void onClick(View v) {
    109         switch (v.getId()) {
    110             case R.id.toggle:
    111                 if (mVirtualDisplay == null) {
    112                     startScreenCapture();
    113                 } else {
    114                     stopScreenCapture();
    115                 }
    116                 break;
    117         }
    118     }
    119 
    120     @Override
    121     public void onActivityResult(int requestCode, int resultCode, Intent data) {
    122         if (requestCode == REQUEST_MEDIA_PROJECTION) {
    123             if (resultCode != Activity.RESULT_OK) {
    124                 Log.i(TAG, "User cancelled");
    125                 Toast.makeText(getActivity(), R.string.user_cancelled, Toast.LENGTH_SHORT).show();
    126                 return;
    127             }
    128             Activity activity = getActivity();
    129             if (activity == null) {
    130                 return;
    131             }
    132             Log.i(TAG, "Starting screen capture");
    133             mResultCode = resultCode;
    134             mResultData = data;
    135             setUpMediaProjection();
    136             setUpVirtualDisplay();
    137         }
    138     }
    139 
    140     @Override
    141     public void onPause() {
    142         super.onPause();
    143         stopScreenCapture();
    144     }
    145 
    146     @Override
    147     public void onDestroy() {
    148         super.onDestroy();
    149         tearDownMediaProjection();
    150     }
    151 
    152     private void setUpMediaProjection() {
    153         mMediaProjection = mMediaProjectionManager.getMediaProjection(mResultCode, mResultData);
    154     }
    155 
    156     private void tearDownMediaProjection() {
    157         if (mMediaProjection != null) {
    158             mMediaProjection.stop();
    159             mMediaProjection = null;
    160         }
    161     }
    162 
    163     private void startScreenCapture() {
    164         Activity activity = getActivity();
    165         if (mSurface == null || activity == null) {
    166             return;
    167         }
    168         if (mMediaProjection != null) {
    169             setUpVirtualDisplay();
    170         } else if (mResultCode != 0 && mResultData != null) {
    171             setUpMediaProjection();
    172             setUpVirtualDisplay();
    173         } else {
    174             Log.i(TAG, "Requesting confirmation");
    175             // This initiates a prompt dialog for the user to confirm screen projection.
    176             startActivityForResult(
    177                     mMediaProjectionManager.createScreenCaptureIntent(),
    178                     REQUEST_MEDIA_PROJECTION);
    179         }
    180     }
    181 
    182     private void setUpVirtualDisplay() {
    183         Log.i(TAG, "Setting up a VirtualDisplay: " +
    184                 mSurfaceView.getWidth() + "x" + mSurfaceView.getHeight() +
    185                 " (" + mScreenDensity + ")");
    186         mVirtualDisplay = mMediaProjection.createVirtualDisplay("ScreenCapture",
    187                 mSurfaceView.getWidth(), mSurfaceView.getHeight(), mScreenDensity,
    188                 DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
    189                 mSurface, null, null);
    190         mButtonToggle.setText(R.string.stop);
    191     }
    192 
    193     private void stopScreenCapture() {
    194         if (mVirtualDisplay == null) {
    195             return;
    196         }
    197         mVirtualDisplay.release();
    198         mVirtualDisplay = null;
    199         mButtonToggle.setText(R.string.start);
    200     }
    201 
    202 }
    203