android M 权限 使用套路（以拨打电话为例）

下面是拨打电话的代码实现

package com.glandroid.phone;import android.Manifest;import android.content.Intent;import android.content.pm.PackageManager;import android.net.Uri;import android.os.Bundle;import android.support.annotation.NonNull;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE = 1;    private EditText mBt_phone;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // 加载布局        setContentView(R.layout.activity_main);        // 1.寻找关心的控件        mBt_phone = (EditText) findViewById(R.id.et_phone);        Button bt_dail = (Button) findViewById(R.id.bt_dail);        bt_dail.setOnClickListener(new MyButtonListener());    }    public void callPhone() {        // 2.当用户点击按钮的时候获取里面的电话号码        String phone =  mBt_phone.getText().toString().trim();        if ("".equals(phone)) {            Toast.makeText(MainActivity.this,"电话号码不能为空", Toast.LENGTH_SHORT).show();        } else {            // 1.创建一个意图对象            Intent intent = new Intent();            // 2.设置动作            intent.setAction(Intent.ACTION_CALL);            // 3.指定动作的数据            intent.setData(Uri.parse("tel://" + phone));            // 4.开启一个界面，根据程序员指定的行为来做事情            startActivity(intent);        }    }    private class MyButtonListener implements View.OnClickListener {        @Override        public void onClick(View v) {            if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED)            {                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE}, MY_PERMISSIONS_REQUEST_CALL_PHONE);            } else {                callPhone();            }        }    }    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE) {            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {                callPhone();            } else {                // Permission Denied                Toast.makeText(MainActivity.this,"Permission Denied", Toast.LENGTH_SHORT).show();            }        }        super.onRequestPermissionsResult(requestCode, permissions, grantResults);    }}

这下面是权限使用时注意的套路：

    private class MyButtonListener implements View.OnClickListener {


        @Override
        public void onClick(View v) {
            if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED)
            {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE}, MY_PERMISSIONS_REQUEST_CALL_PHONE);
            } else {
                callPhone();
            }
        }
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {


        if (requestCode == MY_PERMISSIONS_REQUEST_CALL_PHONE) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                callPhone();
            } else {
                // Permission Denied
                Toast.makeText(MainActivity.this,"Permission Denied", Toast.LENGTH_SHORT).show();
            }
        }


        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}