各位，我加了上面的代碼，結(jié)果第二個按鈕還是不能點開拍照

是這樣嗎，怎么不對，能具體說一下第二個按鈕怎么修改嗎

如果已經(jīng)升級到android6.0以上會有個運行時權(quán)限，按老師這樣敲就sd卡中有圖片但是加載不出來。

解決方法：

1、由于拍照要用到CAMERA權(quán)限，所以現(xiàn)在Manifest文件中加上

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

2、申請運行時權(quán)限

將第二個按鈕的click事件修改如下

?btnStartCamera2.setOnClickListener(new?View.OnClickListener()?{
????????????@Override
????????????public?void?onClick(View?v)?{
????????????????List<String>?permissionList?=?new?ArrayList<String>();
????????????????if(ContextCompat.checkSelfPermission(MainActivity.this,?Manifest.permission.READ_EXTERNAL_STORAGE)?!=?PackageManager.PERMISSION_GRANTED)?{
????????????????????permissionList.add(Manifest.permission.READ_EXTERNAL_STORAGE);
????????????????}
????????????????if(ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.WRITE_EXTERNAL_STORAGE)?!=?PackageManager.PERMISSION_GRANTED)?{
????????????????????permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
????????????????}
????????????????if(ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.CAMERA)?!=?PackageManager.PERMISSION_GRANTED)?{
????????????????????permissionList.add(Manifest.permission.CAMERA);
????????????????}
????????????????if(!permissionList.isEmpty())?{
????????????????????String[]?permissions?=?permissionList.toArray(new?String[permissionList.size()]);
????????????????????ActivityCompat.requestPermissions(MainActivity.this,permissions,1);
????????????????}?else?{
????????????????????Intent?intent?=?new?Intent(MediaStore.ACTION_IMAGE_CAPTURE);
????????????????????Uri?photoUri?=?Uri.fromFile(new?File(mFilePath));
????????????????????intent.putExtra(MediaStore.EXTRA_OUTPUT,photoUri);
????????????????????startActivityForResult(intent,REQUEST2);
????????????????}
????????????}
????????});

? ? ? ?主要進行運行時權(quán)限的申請工作，申請了ManiFest中申請的三個靜態(tài)權(quán)限。

然后

在MainActivity中添加如下代碼

@Override
public?void?onRequestPermissionsResult(int?requestCode,?@NonNull?String[]?permissions,?@NonNull?int[]?grantResults)?{
????super.onRequestPermissionsResult(requestCode,?permissions,?grantResults);
????if(requestCode?==?1)?{
????????if(grantResults.length?>?0)?{
????????????for(int?result?:?grantResults)?{
????????????????if(result?!=?PackageManager.PERMISSION_GRANTED)?{
????????????????????Toast.makeText(MainActivity.this,"必須同意所有權(quán)限才能使用本程序",Toast.LENGTH_SHORT).show();
????????????????????finish();
????????????????????return;
????????????????}
????????????}
????????????Intent?intent?=?new?Intent(MediaStore.ACTION_IMAGE_CAPTURE);
????????????Uri?photoUri?=?Uri.fromFile(new?File(mFilePath));
????????????intent.putExtra(MediaStore.EXTRA_OUTPUT,photoUri);
????????????startActivityForResult(intent,REQUEST2);
????????}?else?{
????????????Toast.makeText(MainActivity.this,"發(fā)生未知錯誤",Toast.LENGTH_SHORT).show();
????????????finish();
????????}
????}
}

主要進行申請權(quán)限時是否被同意的情況

最后

如果三個權(quán)限都同意了的話ImageView就能成功加載出圖片了。

祝你成功了。

android.permission.WRITE_EXTERNAL_STORAGE這個權(quán)限添加了嗎