安卓取图片（一）进入相机

最新推荐文章于 2023-09-09 03:42:04 发布

原创最新推荐文章于 2023-09-09 03:42:04 发布 · 355 阅读

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Section1 简单代码

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    doGetImageFromCamera();
}
private void doGetImageFromCamera() {
    //1 new Intent with Action
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    //2 set output Uri
    Uri imageUri = setOutputFileUri();
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    //3 startActivityForResult
    startActivityForResult(cameraIntent, 10000);
}
public Uri setOutputFileUri() {
    String imagePath = getImagePath("haha");
    File file = new File(imagePath);
    return Uri.fromFile(file);
}
public static String getImagePath(String name) {
    String filePath = Environment.getExternalStorageDirectory()
            + File.separator + "tempPath" + File.separator + name;
    return filePath;
}

我们 1.new 了一个intent,

     2.设置好拍照的output Uri，

     3.startActivityForResult

 结果报如下错误，

 android.os.FileUriExposedException: file:///storage/emulated/0/tempPath/haha exposed beyond app through ClipData.Item.getUri()

查资料可知，

这是因为谷歌在targetSdkVersion为 android N（7.0 api24）

的情况下作了权限的限制。

解决方案1：把targetSdkVersion 降为23

解决方案2：通过FileProvider 的方式来解决

解决方案3：使用ContentProvider方式传递uri

我们选择方案3

Section 2  ContentProvider 传递uri

修改后的代码如下

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    doGetImageFromCamera();
}
private void doGetImageFromCamera() {
    //1 new Intent with Action
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    //2 set output Uri
    Uri imageUri = setOutputFileUri();
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    //3 startActivityForResult
    startActivityForResult(cameraIntent, 10000);
}
public Uri setOutputFileUri() {
    String imagePath = getImagePath("haha");
    ContentValues contentValues = new ContentValues(1);
    contentValues.put(MediaStore.Images.Media.DATA, imagePath);
    return getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,contentValues);
}
public static String getImagePath(String name) {
    String filePath = Environment.getExternalStorageDirectory()
            + File.separator + "tempPath" + File.separator + name;
    return filePath;
}
报错如下

 java.lang.SecurityException: Permission Denial:

writing com.android.providers.media.MediaProvider uri content://media/external/images/media from pid=13656, uid=10227

requires android.permission.WRITE_EXTERNAL_STORAGE, or grantUriPermission()

缺少权限

Section3

添加   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 权限
现在，我们终于可以进入相机界面了。。