android6.0动态权限管理案例-打电话案例

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package com.example.phone2;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
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.Button;
import android.widget.EditText;
import android.widget.Toast;

import static android.content.pm.PackageManager.PERMISSION_GRANTED;

public class MainActivity extends AppCompatActivity {

    private EditText et;
    private static final int MY_PERMISSIONS_REQUEST_CALL_PHONE = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.active_main);

        et = findViewById(R.id.et_text);
        Button btn = findViewById(R.id.btn_call);
        btn.setOnClickListener(new MyButtonListener());
    }

    public void call() {
        String phone = et.getText().toString().trim();
        System.out.println(phone);
        if ("".equals(phone)) {
            Toast.makeText(MainActivity.this, "电话不能为空", Toast.LENGTH_LONG).show();
        } else {
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_CALL);
            intent.setData(Uri.parse("tel://" + phone));
            startActivity(intent);
        }
    }

    class MyButtonListener implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            int hasCallPermission = ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE);
            System.out.println(hasCallPermission);
            if (hasCallPermission == PERMISSION_GRANTED) {
                System.out.println("授权通过");
                call();
            } else {
                System.out.println("授权失败");
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE}, MY_PERMISSIONS_REQUEST_CALL_PHONE);
               }
        }

    }
}