关键代码
判断用户是否已经授权。ContextCompat.checkSelfPermission()方法第一个参数是 Context,第二个参数是具体的权限名。如果返回值不等于PackageManager.PERMISSION_GRANTED，则代表没有授权
ContextCompat
.checkSelfPermission(MainActivity
.this, Manifest
.permission
.CALL_PHONE
)!= PackageManager
.PERMISSION_GRANTED
申请权限。第一个参数是activity实例，第二个是String数组，把申请的权限名放在数组中即可。第三个参数是请求码，只要是唯一值就可以了
ActivityCompat
.requestPermissions(MainActivity
.this,new String[]{Manifest
.permission
.CALL_PHONE
},1);
回调方法。系统权限申请对话框选择选项后，无论选择什么都会回调这个方法。然后通过请求码进行操作
@Override
public void onRequestPermissionsResult(int requestCode
, @NonNull String
[] permissions
, @NonNull int[] grantResults
) {
switch (requestCode
){
case 1:
if(grantResults
.length
>0&& grantResults
[0]==PackageManager
.PERMISSION_GRANTED
){
call();
}else{
Toast
.makeText(this,"You denied the permission",Toast
.LENGTH_SHORT
).show();
}
break;
default:
break;
}
}
完整代码
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState
) {
super.onCreate(savedInstanceState
);
setContentView(R
.layout
.activity_main
);
Button makeCall
=findViewById(R
.id
.make_call
);
makeCall
.setOnClickListener(new 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
},1);
}else{
call();
}
}
});
}
private void call(){
try {
Intent intent
=new Intent(Intent
.ACTION_CALL
);
intent
.setData(Uri
.parse("tel:10086"));
startActivity(intent
);
} catch (Exception e
) {
Log
.e("TAG","try.......");
e
.printStackTrace();
}
}
@Override
public void onRequestPermissionsResult(int requestCode
, @NonNull String
[] permissions
, @NonNull int[] grantResults
) {
switch (requestCode
){
case 1:
if(grantResults
.length
>0&& grantResults
[0]==PackageManager
.PERMISSION_GRANTED
){
call();
}else{
Toast
.makeText(this,"You denied the permission",Toast
.LENGTH_SHORT
).show();
}
break;
default:
break;
}
}
}
记得要添加权限，不然不会弹出申请权限，直接显示未授权
<uses
-permission android
:name
="android.permission.CALL_PHONE"/>
