Question

以下图像是应用程序https://play.google.com/store/apps/details?id=jp.snowlife01.android.clipboard的窗口。我将其命名为主窗口。

似乎主窗口不是普通窗口。在其他窗口的顶部，主窗口无法移动。

单击主窗口中的最小化按钮将显示一个小点图标，单击该小点图标可以移动小点图标，可以恢复主窗口。

我认为小点图标是SYSTEM_ALERT_WINDOW，但是主窗口如何？

图片

Answer 1

您可以使用WindowManager创建浮动视图，而无需授予任何权限。我已经开发了一个示例代码，您可以轻松使用它。

FloatViewManager.java：

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.graphics.PixelFormat;
import android.os.Build;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import static android.content.Context.WINDOW_SERVICE;


/**
 * Created by aminography on 11/1/2018.
 */
public class FloatViewManager {

    private static boolean mIsFloatViewShowing;

    private Activity mActivity;
    private WindowManager mWindowManager;
    private View mFloatView;
    private WindowManager.LayoutParams mFloatViewLayoutParams;
    private boolean mFloatViewTouchConsumedByMove = false;
    private int mFloatViewLastX;
    private int mFloatViewLastY;
    private int mFloatViewFirstX;
    private int mFloatViewFirstY;

    @SuppressLint("InflateParams")
    public FloatViewManager(Activity activity) {
        mActivity = activity;
        LayoutInflater inflater = LayoutInflater.from(activity);
        mFloatView = inflater.inflate(R.layout.float_view_layout, null);
        TextView textView = mFloatView.findViewById(R.id.textView);
        textView.setText("I'm a float view!");
        ImageButton imageButton = mFloatView.findViewById(R.id.imageButton);
        imageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dismissFloatView();
            }
        });

        mFloatView.setOnClickListener(mFloatViewOnClickListener);
        mFloatView.setOnTouchListener(mFloatViewOnTouchListener);

        mFloatViewLayoutParams = new WindowManager.LayoutParams();
        mFloatViewLayoutParams.format = PixelFormat.TRANSLUCENT;
        mFloatViewLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;

        mFloatViewLayoutParams.type = Build.VERSION.SDK_INT >= Build.VERSION_CODES.O
                ? WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
                : WindowManager.LayoutParams.TYPE_TOAST;

        mFloatViewLayoutParams.gravity = Gravity.CENTER;
        mFloatViewLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
        mFloatViewLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;

    }

    public void dismissFloatView() {
        if (mIsFloatViewShowing) {
            mIsFloatViewShowing = false;
            mActivity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    if (mWindowManager != null) {
                        mWindowManager.removeViewImmediate(mFloatView);
                    }
                }
            });
        }
    }

    public void showFloatView() {
        if (!mIsFloatViewShowing) {
            mIsFloatViewShowing = true;
            mActivity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    if (!mActivity.isFinishing()) {
                        mWindowManager = (WindowManager) mActivity.getSystemService(WINDOW_SERVICE);
                        if (mWindowManager != null) {
                            mWindowManager.addView(mFloatView, mFloatViewLayoutParams);
                        }
                    }
                }
            });
        }
    }

    @SuppressWarnings("FieldCanBeLocal")
    private View.OnClickListener mFloatViewOnClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mActivity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(mActivity, "Float view is clicked!", Toast.LENGTH_SHORT).show();
                }
            });
        }
    };

    @SuppressWarnings("FieldCanBeLocal")
    private View.OnTouchListener mFloatViewOnTouchListener = new View.OnTouchListener() {

        @SuppressLint("ClickableViewAccessibility")
        @TargetApi(Build.VERSION_CODES.FROYO)
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            WindowManager.LayoutParams prm = mFloatViewLayoutParams;
            int totalDeltaX = mFloatViewLastX - mFloatViewFirstX;
            int totalDeltaY = mFloatViewLastY - mFloatViewFirstY;

            switch (event.getActionMasked()) {
                case MotionEvent.ACTION_DOWN:
                    mFloatViewLastX = (int) event.getRawX();
                    mFloatViewLastY = (int) event.getRawY();
                    mFloatViewFirstX = mFloatViewLastX;
                    mFloatViewFirstY = mFloatViewLastY;
                    break;
                case MotionEvent.ACTION_UP:
                    break;
                case MotionEvent.ACTION_MOVE:
                    int deltaX = (int) event.getRawX() - mFloatViewLastX;
                    int deltaY = (int) event.getRawY() - mFloatViewLastY;
                    mFloatViewLastX = (int) event.getRawX();
                    mFloatViewLastY = (int) event.getRawY();
                    if (Math.abs(totalDeltaX) >= 5 || Math.abs(totalDeltaY) >= 5) {
                        if (event.getPointerCount() == 1) {
                            prm.x += deltaX;
                            prm.y += deltaY;
                            mFloatViewTouchConsumedByMove = true;
                            if (mWindowManager != null) {
                                mWindowManager.updateViewLayout(mFloatView, prm);
                            }
                        } else {
                            mFloatViewTouchConsumedByMove = false;
                        }
                    } else {
                        mFloatViewTouchConsumedByMove = false;
                    }
                    break;
                default:
                    break;
            }
            return mFloatViewTouchConsumedByMove;
        }
    };

}

float_view_layout.xml：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <android.support.v7.widget.AppCompatTextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#ff4444"
        android:padding="32dp"
        android:text="text"
        android:textColor="#ffffff"
        android:textSize="24sp" />

    <android.support.v7.widget.AppCompatImageButton
        android:id="@+id/imageButton"
        style="@style/Base.Widget.AppCompat.Button.Borderless"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_gravity="top|right"
        android:src="@drawable/ic_close_white_24dp" />

</FrameLayout>

MainActivity.java：

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;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CODE_DRAW_OVERLAY_PERMISSION = 5;
    private FloatViewManager mFloatViewManager;

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

        mFloatViewManager = new FloatViewManager(MainActivity.this);

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (checkDrawOverlayPermission()) {
                    mFloatViewManager.showFloatView();
                }
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE_DRAW_OVERLAY_PERMISSION) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && Settings.canDrawOverlays(this)) {
                mFloatViewManager.showFloatView();
            }
        }
    }

    private boolean checkDrawOverlayPermission() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(this)) {
            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName()));
            startActivityForResult(intent, REQUEST_CODE_DRAW_OVERLAY_PERMISSION);
            return false;
        } else {
            return true;
        }
    }

}

视觉结果：

Answer 2

将假定其类型为TYPE_APPLICATION_OVERLAY。

可能与android:theme="@android:style/Theme.Dialog"组合。

，它需要Manifest.permission.SYSTEM_ALERT_WINDOW。

除非从Play商店进行安装，否则您必须手动启用权限：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    startActivity(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION));
}

请参阅documentation（实际上并没有太多适合的语言）。

如何创建一个像Clipboard Pro App这样的浮动窗口？

2 个答案: