Android 运行时权限

package basicandroid.intozhou.cn.permission;

import android.Manifest;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.btnCallPhone).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //检查是否拥有拨打电话权限
                if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
                    if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.CALL_PHONE)) {
                        //当用户拒绝授权并勾选了不在询问后执行到这里，你需要弹出信息告知用户你为什么需要这个权限，并辅助用户完成权限授予
                        showMessageOkCancel();
                        return;
                    }
                    //请求电话权限
                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE}, 1);
                } else {
                    //已经授权，直接拨打电话
                    callPhone();
                }
            }
        });

    }

    AlertDialog dialog;

    public void showMessageOkCancel() {
        if (dialog == null) {
            dialog = new AlertDialog.Builder(this)
                    .setCancelable(false)
                    .setNegativeButton("我知道了", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.cancel();
                        }
                    })
                    .setPositiveButton("去授权", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            toSelfSetting(MainActivity.this);
                            dialog.cancel();
                        }
                    })
                    .create();
        }

        dialog.show();
    }

    private void callPhone() {
        Intent intent = new Intent(Intent.ACTION_CALL);
        intent.setData(Uri.parse("tel:10086"));
        startActivity(intent);
    }


    public void toSelfSetting(Context context) {
        Intent mIntent = new Intent();
        mIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        mIntent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
        mIntent.setData(Uri.fromParts("package", context.getPackageName(), null));
        context.startActivity(mIntent);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    callPhone();
                } else {
                    Toast.makeText(this, "请求拨打电话权限失败", Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
}

关键方法

• ContextCompat.checkSelfPermission 检查是否拥有权限
• ActivityCompat.shouldShowRequestPermissionRationale 如果用户拒绝授权且勾选了不在询问复选框后，下次再次请求权限时会返回 true，你需要弹出信息告知用户你为什么需要这个权限，并辅助用户完成权限授予
• ActivityCompat.requestPermissions 请求权限
• onRequestPermissionsResult 请求权限结果回调