Android 6.0+ 项目开发中用到适配功能

1：在android6.0之后使用WindowManager需要使用者认真同意跳入一个界面

参考博客:https://blog.csdn.net/chenlove1/article/details/52047105

  代码解决：
  1、
  6.0 之前添加权限即可使用WindowManager
  
  2、6.0+之后： 就是跳过去把这个开关打开
    // Android6.0+ WindowManager使用
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (!Settings.canDrawOverlays(WindosManagerActivity.this)) {
                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                        Uri.parse("package:" + getPackageName()));
                startActivityForResult(intent, 10);
                Log.e("denganzhi","onCreate->开关没有打开");
            }else{
                Log.e("denganzhi","onCreate->开关已经打开,可以干活了");
            }
        }
        
        
          @TargetApi(23)
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 10) {
            if (!Settings.canDrawOverlays(this)) {
                // SYSTEM_ALERT_WINDOW permission not granted...
                Log.e("denganzhi","权限没有通过");
            }else{
                Log.e("denganzhi","权限通过");
            }
        }
    }

 具体界面：

2. FileProvider适配     拍照、启动App安装 

https://blog.csdn.net/lmj623565791/article/details/72859156
大神博客写的大概意思是:
 Android7.0 禁止应用向外部使用file:// URI 共享文件
 解决： 使用content:// URI 指向文件, 并且给URL 临时访问权限，通过FileProvider实现临时访问权限

1.  读写目录权限动态申请:

 private final int SDK_PERMISSION_REQUEST = 127;
 
// 权限动态申请
  ArrayList permissions = new ArrayList();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if(checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
                permissions.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
            }
            if (permissions.size() > 0) {
                requestPermissions(permissions.toArray(new String[permissions.size()]), SDK_PERMISSION_REQUEST);
            }
        }
// 是否允许
		
		 @TargetApi(23)
    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        // TODO Auto-generated method stub

        if (requestCode == SDK_PERMISSION_REQUEST)
        {

            if (grantResults[0] == PackageManager.PERMISSION_GRANTED )
            {
                Toast.makeText(FileProviderActivity.this,"权限通过："+grantResults.length, Toast.LENGTH_SHORT).show();
            }
        }
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    }

  2. 配置FileProvider

2.1.AndroidManifest.xml 中配置FileProvider 组件：

 2.2.在res/xml创建文件夹配置file_paths.xml 文件

  实现拍照功能： 

   ImageView mIvPhoto;  
  // android Api 调用  
 public  void callPhoto(View view){
            Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                String filename = new SimpleDateFormat("yyyyMMdd-HHmmss", Locale.CHINA)
                        .format(new Date()) + ".png";
                File file = new File(Environment.getExternalStorageDirectory()+"/1moviestest/", filename);
                mCurrentPhotoPath = file.getAbsolutePath();
                Uri fileUri = null;
                if (Build.VERSION.SDK_INT >= 24) {
                    fileUri = FileProvider.getUriForFile(this, "com.denganzhi.permission", file);
                } else {
                    fileUri = Uri.fromFile(file);
                }
             //   Uri fileUri = FileProvider.getUriForFile(this, "com.zhy.android7.fileprovider", file);
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
                startActivityForResult(takePictureIntent, REQUEST_CODE_TAKE_PHOTO);
            }
    }
	
	
	 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
		// mCurrentPhotoPath 拍照的图片路径，使用imageView显示出来
        Log.e("currentPath:",mCurrentPhotoPath);
        if (resultCode == RESULT_OK && requestCode == REQUEST_CODE_TAKE_PHOTO) {
            mIvPhoto.setImageBitmap(BitmapFactory.decodeFile(mCurrentPhotoPath));
        }
        // else tip?

    }

   Apk启动安装功能

  // 启动安装
    public void apkInstallMethod(View view){
        //File file = new File(Environment.getExternalStorageDirectory(), "actionbar.apk");
        File file = new File(getFilesDir(),"actionbar.apk");
        Log.e("denganzhi1",file.getAbsolutePath());
        if(file.exists()==false){
            copyDB("actionbar.apk");   // 把assert下actionbar.apk 拷贝的 /data/data/packageName/file 下 , 没有安装包
            Toast.makeText(ApkInstallActivity.this,"文件不存在",Toast.LENGTH_SHORT).show();
            return;
        }
        Uri fileUri = null;
        Intent intent = new Intent(Intent.ACTION_VIEW);
        if (Build.VERSION.SDK_INT >= 24) {
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
      // 这里对应AndroidManifest.xml 配置authorities  com.denganzhi.permission
            fileUri = FileProvider.getUriForFile(this, "com.denganzhi.permission", file);
        } else {
            fileUri = Uri.fromFile(file);
        }
            intent.setDataAndType(fileUri,
                    "application/vnd.android.package-archive");
            startActivity(intent);
    }

    private void copyDB(final String dbname) {
        new Thread(){
            public void run() {
                try {
                    File file = new File(getFilesDir(),dbname);
                    if(file.exists()&&file.length()>0){
                        Log.e("denganzhi1","数据库是存在的。无需拷贝");
                        return ;
                    }
                    InputStream is = getAssets().open(dbname);
                    FileOutputStream fos  = openFileOutput(dbname, MODE_PRIVATE);
                    byte[] buffer = new byte[1024];
                    int len = 0;
                    while((len = is.read(buffer))!=-1){
                        fos.write(buffer, 0, len);
                    }
                    is.close();
                    fos.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            };
        }.start();
    }