【问题标题】:How to display image with intent.ACTION_VIEW如何显示带有意图的图像。ACTION_VIEW
【发布时间】:2017-02-17 02:13:53
【问题描述】:

我的语法可以在 android 5.1 上运行,但不能在 android 7.1 上运行......

File file = new File(Environment.getExternalStorageDirectory(), "Pictures/1481853170451.jpg");
Toast.makeText(MainActivity.this, file.getPath(), Toast.LENGTH_LONG).show();
Uri path = Uri.fromFile(file);

if (file.exists()) {
  Intent intent = new Intent();
  intent.setAction(android.content.Intent.ACTION_VIEW);
  intent.setDataAndType(path, "image/*");
  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {                       
  this.startActivity(intent);
} catch (ActivityNotFoundException e) {
}

谁能告诉我可能的答案。提前谢谢你....

【问题讨论】:

标签: android android-intent android-5.1.1-lollipop android-7.1-nougat


【解决方案1】:

步骤如下

1) 在 AndroidManifest.xml 中,在应用程序标签中添加以下提供程序

 <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>

2) 使用以下示例内容在 res/xml 文件夹中创建 provider_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <files-path name="internal_files" path="DATA/TITLE/"/>
</paths>

3) 在Activity中创建图片文件,路径如下图

  context.getFilesDir() + File.separator + "DATA" + File.separator + "TITLE"+ File.separator + "sample_image_file"

4) 使用以下代码打开图片文件

 Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            Uri photoURI = FileProvider.getUriForFile(context,
                    BuildConfig.APPLICATION_ID + ".provider",
                    new File(context.getFilesDir() + File.separator + "DATA" + File.separator + "TITLE"+ File.separator + "sample_image_file"));
            intent.setDataAndType(photoURI,"image/*");
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            context.startActivity(Intent.createChooser(intent, "View using"));

【讨论】:

    【解决方案2】:

    只需通过以下link

    【讨论】:

      【解决方案3】:

      试试这个,

      相机权限

          private static final int REQUEST_STORAGE = 112;
      
      
          btn.setOnClickListener(new View.OnClickListener() {
                      @Override
                      public void onClick(View v) {
                        if (Build.VERSION.SDK_INT >= 23) {
                              String[] PERMISSIONS = {android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.READ_EXTERNAL_STORAGE};
                              if (!hasPermissions(mContext, PERMISSIONS)) {
                                  ActivityCompat.requestPermissions((Activity) mContext, PERMISSIONS, REQUEST_STORAGE );
                              } else {
                                  getImage();
                              }
                          } else {
                              getImage();
                          }
      
                      }
                  });
              }
      

      获取权限结果

          @Override
          public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
              super.onRequestPermissionsResult(requestCode, permissions, grantResults);
              switch (requestCode) {
                  case REQUEST_STORAGE: {
                      if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                          getImage();
                      } 
                  }
              }
          }
      

      检查棉花糖的权限

          private static boolean hasPermissions(Context context, String... permissions) {
              if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
                  for (String permission : permissions) {
                      if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                          return false;
                      }
                  }
              }
              return true;
          }
      

      从外部存储中获取图像

          public void getImage()
          {
              File file = new File(Environment.getExternalStorageDirectory(), "Pictures/1481853170451.jpg");
              Toast.makeText(MainActivity.this, file.getPath(), Toast.LENGTH_LONG).show();
              Uri path = Uri.fromFile(file);
      
              if (file.exists()) {
                Intent intent = new Intent();
                intent.setAction(android.content.Intent.ACTION_VIEW);
                intent.setDataAndType(path, "image/*");
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
              try {                       
                this.startActivity(intent);
              } catch (ActivityNotFoundException e) {
              }
          }       
      

      AndroidManifest.xml

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

      【讨论】:

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