Android6.0权限申请解决方案

<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.autofocus"/>

2、在app目录下的build.gradle下，是否有
compile 'com.android.support:appcompat-v7:24.2.0'
没有的手动添加
File->project structure->app->Dependendencies->加号->Library dependendency->'com.android.support:appcompat-v7:24.2.0'

3、在MainActivity中的点击事件从

public void saoma(View view){

startActivityForResult(new Intent(DemoActivity.this, CaptureActivity.class),0);
}
修改为
public void saoma(View view){

//开启摄像头权限
int i= ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA);
if(i!= PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA},2);
return;
}

startActivityForResult(new Intent(DemoActivity.this, CaptureActivity.class),0);

}
4、然后在MainActivity重写onRequestPermissionsResult方法
//当用户选择是否允许
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode==2){
//证明申请到权限
if(grantResults[0]==PackageManager.PERMISSION_GRANTED){
startActivityForResult(new Intent(DemoActivity.this, CaptureActivity.class),0);
}
}
}

5、自此，至少在6.0以下的手机都可以成功申请到权限

最后感谢于连林的视频

视频链接http://v.youku.com/v_show/id_XMTM2NzE1OTUwMA==.html?beta&&f=26161806&from=y1.2-3.4.22&spm=0.0.item_XMTM2NzE1OTUwMA==.A.LNTPir