android M 权限使用套路（以拨打电话为例）

迷南。 2022-06-10 06:14 103阅读 0赞

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);  
    \}  
\}