开发一个相机应用，需要申请三个权限：相机、读文件、写文件。
1、在AndroidManifest.xml中添加
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
2、新建一个Permission类
public class Permission {
public static final int REQUEST_CODE = 5;
//定义三个权限
private static final String[] permission = new String[]{
Manifest.permission.CAMERA,
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
};
//每个权限是否已授
public static boolean isPermissionGranted(Activity activity){
if(Build.VERSION.SDK_INT >= 23){
for(int i = 0; i < permission.length;i++) {
int checkPermission = ContextCompat.checkSelfPermission(activity,permission[i]);
if(checkPermission != PackageManager.PERMISSION_GRANTED){
return false;
}
}
return true;
}else{
return true;
}
}
public static boolean checkPermission(Activity activity){
if(isPermissionGranted(activity)) {
return true;
} else {
//如果没有设置过权限许可，则弹出系统的授权窗口
ActivityCompat.requestPermissions(activity,permission,REQUEST_CODE);
return false;
}
}
}
3、在MainActivity中加入授权操作
@Override
protected void onStart() {
super.onStart();
Permission.checkPermission(this);
}
@Override
protected void onResume() {
super.onResume();
if(Permission.isPermissionGranted(this)) {
Log.i("PERMISSION","请求权限成功");
}
}
初步授权成功
4、在MainActivity中处理授权失败结果，拒绝授权则退出应用
@Override
public void onRequestPermissionsResult(
int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == Permission.REQUEST_CODE) {
for (int grantResult : grantResults) {
if (grantResult != PackageManager.PERMISSION_GRANTED) {
Log.e("Permission","授权失败！");
// 授权失败，退出应用
this.finish();
return;
}
}
}
}
效果图
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