Question

您好我的目标是在我访问过的每项活动中显示包含视频的布局我的聊天应用程序，但有可能吗？

如果是，请指导我做一个方法，谢谢你。

我知道如果我使用片段是可能的，但我们的应用程序方法现在正在使用很多活动

Answer 1

步骤1：将android.permission.SYSTEM_ALERT_WINDOW权限添加到AndroidManifest.xml文件。此权限允许应用创建窗口，显示在所有其他应用之上。

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

步骤2：创建要显示的聊天头的布局。

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="65dp"
    android:id="@+id/chat_head_root"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <!--Profile image for the chat head.-->
    <ImageView
        android:id="@+id/chat_head_profile_iv"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginTop="8dp"
        android:src="@drawable/ic_android_circle"
        tools:ignore="ContentDescription"/>

    <!--Close button-->
    <ImageView
        android:id="@+id/close_btn"
        android:layout_width="26dp"
        android:layout_height="26dp"
        android:layout_marginLeft="40dp"
        android:src="@drawable/ic_close"
        tools:ignore="ContentDescription"/>
</RelativeLayout>

现在创建一个名为ChatHeadService的服务。每当要显示聊天头时，请使用startService（）命令启动服务。在服务的onCreate（）中，我们将在窗口的左上角添加聊天头的布局。

要拖动聊天头以及用户的触摸，我们必须覆盖OnTouchListener（）。并实施onclick以停止服务。

服务类

import android.app.Service;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.IBinder;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;

public class ChatHeadService extends Service {

    private WindowManager mWindowManager;
    private View mChatHeadView;

    public ChatHeadService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        //Inflate the chat head layout we created
        mChatHeadView = LayoutInflater.from(this).inflate(R.layout.layout_chat_head, null);

        //Add the view to the window.
        final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);

        //Specify the chat head position
        params.gravity = Gravity.TOP | Gravity.LEFT;        //Initially view will be added to top-left corner
        params.x = 0;
        params.y = 100;

        //Add the view to the window
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mWindowManager.addView(mChatHeadView, params);

        //Set the close button.
        ImageView closeButton = (ImageView) mChatHeadView.findViewById(R.id.close_btn);
        closeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //close the service and remove the chat head from the window
                stopSelf();
            }
        });

        //Drag and move chat head using user's touch action.
        final ImageView chatHeadImage = (ImageView) mChatHeadView.findViewById(R.id.chat_head_profile_iv);
        chatHeadImage.setOnTouchListener(new View.OnTouchListener() {
            private int lastAction;
            private int initialX;
            private int initialY;
            private float initialTouchX;
            private float initialTouchY;

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:

                        //remember the initial position.
                        initialX = params.x;
                        initialY = params.y;

                        //get the touch location
                        initialTouchX = event.getRawX();
                        initialTouchY = event.getRawY();

                        lastAction = event.getAction();
                        return true;
                    case MotionEvent.ACTION_UP:
                        //As we implemented on touch listener with ACTION_MOVE,
                        //we have to check if the previous action was ACTION_DOWN
                        //to identify if the user clicked the view or not.
                        if (lastAction == MotionEvent.ACTION_DOWN) {
                            //Open the chat conversation click.
                            Intent intent = new Intent(ChatHeadService.this, ChatActivity.class);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            startActivity(intent);

                            //close the service and remove the chat heads
                            stopSelf();
                        }
                        lastAction = event.getAction();
                        return true;
                    case MotionEvent.ACTION_MOVE:
                        //Calculate the X and Y coordinates of the view.
                        params.x = initialX + (int) (event.getRawX() - initialTouchX);
                        params.y = initialY + (int) (event.getRawY() - initialTouchY);

                        //Update the layout with new X & Y coordinate
                        mWindowManager.updateViewLayout(mChatHeadView, params);
                        lastAction = event.getAction();
                        return true;
                }
                return false;
            }
        });
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mChatHeadView != null) mWindowManager.removeView(mChatHeadView);
    }
}

样本活动

import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private static final int CODE_DRAW_OVER_OTHER_APP_PERMISSION = 2084;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Check if the application has draw over other apps permission or not?
        //This permission is by default available for API<23. But for API > 23
        //you have to ask for the permission in runtime.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(this)) {

            //If the draw over permission is not available open the settings screen
            //to grant the permission.
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                    Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, CODE_DRAW_OVER_OTHER_APP_PERMISSION);
        } else {
            initializeView();
        }
    }

    /**
     * Set and initialize the view elements.
     */
    private void initializeView() {
        findViewById(R.id.notify_me).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                startService(new Intent(MainActivity.this, ChatHeadService.class));
                finish();// comment this if you want your activity not to close.
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CODE_DRAW_OVER_OTHER_APP_PERMISSION) {

            //Check if the permission is granted or not.
            if (resultCode == RESULT_OK) {
                initializeView();
            } else { //Permission is not available
                Toast.makeText(this,
                        "Draw over other app permission not available. Closing the application",
                        Toast.LENGTH_SHORT).show();

                finish();
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

显示每次活动访问的布局

1 个答案: