第四十三篇--发送短信及创建函数快捷键

Android6.0以上需要添加运行时权限，为了方便处理，将它们归于一个类，需要调用权限时使用就好

BaseActivity.java

package com.example.aimee.sendmessage;

import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

/**
 * @author Admin
 * @version $Rev$
 * @des ${TODO}
 * @updateAuthor $Author$
 * @updateDes ${TODO}
 */
public class BaseActivity extends AppCompatActivity {
    //**************** Android M Permission (Android 6.0权限控制代码封装)
    private int permissionRequestCode = 88;
    private PermissionCallback permissionRunnable;

    public interface PermissionCallback {
        void hasPermission();

        void noPermission();
    }

    /**
     * Android M运行时权限请求封装
     *
     * @param permissionDes 权限描述
     * @param runnable      请求权限回调
     * @param permissions   请求的权限（数组类型），直接从Manifest中读取相应的值，比如Manifest.permission.WRITE_CONTACTS
     */
    public void performCodeWithPermission(@NonNull String permissionDes, PermissionCallback runnable, @NonNull String... permissions) {
        if (permissions == null || permissions.length == 0)
            return;
        //        this.permissionrequestCode = requestCode;
        this.permissionRunnable = runnable;
        if ((Build.VERSION.SDK_INT < Build.VERSION_CODES.M) || checkPermissionGranted(permissions)) {
            if (permissionRunnable != null) {
                permissionRunnable.hasPermission();
                permissionRunnable = null;
            }
        } else {
            //permission has not been granted.
            requestPermission(permissionDes, permissionRequestCode, permissions);
        }

    }

    private boolean checkPermissionGranted(String[] permissions) {
        boolean flag = true;
        for (String p : permissions) {
            if (ActivityCompat.checkSelfPermission(this, p) != PackageManager.PERMISSION_GRANTED) {
                flag = false;
                break;
            }
        }
        return flag;
    }

    private void requestPermission(String permissionDes, final int requestCode, final String[] permissions) {
        if (shouldShowRequestPermissionRationale(permissions)) {
            /*1. 第一次请求权限时，用户拒绝了，下一次：shouldShowRequestPermissionRationale()  返回 true，应该显示一些为什么需要这个权限的说明
            2.第二次请求权限时，用户拒绝了，并选择了“不在提醒”的选项时：shouldShowRequestPermissionRationale()  返回 false
            3. 设备的策略禁止当前应用获取这个权限的授权：shouldShowRequestPermissionRationale()  返回 false*/
            // Provide an additional rationale to the user if the permission was not granted
            // and the user would benefit from additional context for the use of the permission.
            // For example, if the request has been denied previously.

            //            Snackbar.make(getWindow().getDecorView(), requestName,
            //                    Snackbar.LENGTH_INDEFINITE)
            //                    .setAction(R.string.common_ok, new View.OnClickListener() {
            //                        @Override
            //                        public void onClick(View view) {
            //                            ActivityCompat.requestPermissions(BaseAppCompatActivity.this,
            //                                    permissions,
            //                                    requestCode);
            //                        }
            //                    })
            //                    .show();
            //如果用户之前拒绝过此权限，再提示一次准备授权相关权限
            new AlertDialog.Builder(this)
                    .setTitle("提示")
                    .setMessage(permissionDes)
                    .setPositiveButton("授权", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            ActivityCompat.requestPermissions(BaseActivity.this, permissions, requestCode);
                        }
                    }).show();

        } else {
            // Contact permissions have not been granted yet. Request them directly.
            ActivityCompat.requestPermissions(BaseActivity.this, permissions, requestCode);
        }
    }

    private boolean shouldShowRequestPermissionRationale(String[] permissions) {
        boolean flag = false;
        for (String p : permissions) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, p)) {
                flag = true;
                break;
            }
        }
        return flag;
    }

    /**
     * Callback received when a permissions request has been completed.
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        if (requestCode == permissionRequestCode) {
            if (verifyPermissions(grantResults)) {
                if (permissionRunnable != null) {
                    permissionRunnable.hasPermission();
                    permissionRunnable = null;
                }
            } else {
                Toast.makeText(this, "暂无权限执行相关操作！", Toast.LENGTH_SHORT).show();
                if (permissionRunnable != null) {
                    permissionRunnable.noPermission();
                    permissionRunnable = null;
                }
            }
        } else {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }

    }

    public boolean verifyPermissions(int[] grantResults) {
        // At least one result must be checked.
        if (grantResults.length < 1) {
            return false;
        }

        // Verify that each required permission has been granted, otherwise return false.
        for (int result : grantResults) {
            if (result != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }
    //********************** END Android M Permission ****************************************
}

但是值得注意的是，不要忘记在Manifest中添加相应的权限。

发送短信需要的权限是

<uses-permission android:name="android.permission.SEND_SMS"/>

界面设计的代码就不写了，自行设计。主要是两个编辑文本和一个发送Button

MainActivity.java

package com.example.aimee.sendmessage;

import android.Manifest;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends BaseActivity {

    private EditText mEtPhone;
    private EditText mEtMessage;
    private Button mBtSend;

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

        //1.获取到界面上的控件et_phone
        mEtPhone = findViewById(R.id.et_phone);
        //2.获取到界面上的控件et_message
        mEtMessage = findViewById(R.id.et_message);
        //3.获取到见面上的控件bt_send，并设置监听
        mBtSend = findViewById(R.id.bt_send);

        mBtSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final String phoneNum = mEtPhone.getText().toString().trim();//trim
                final String message = mEtMessage.getText().toString().trim();
                if ("".equals(phoneNum) || "".equals(message)){
                    Toast.makeText(MainActivity.this,"号码和内容不能为空",Toast.LENGTH_SHORT).show();
                    return;
                }
                System.out.println(phoneNum + ":" + message);
                performCodeWithPermission("发送短信权限", new PermissionCallback() {
                    @Override
                    public void hasPermission() {
                        SmsManager smsManager = SmsManager.getDefault();
                        smsManager.sendTextMessage(phoneNum, null,message,null,null);

                    }

                    @Override
                    public void noPermission() {
                        Toast.makeText(MainActivity.this,"未授权",Toast.LENGTH_SHORT).show();

                    }
                }, Manifest.permission.SEND_SMS);
            }
        });
    }
}

另外补充一个单元测试小知识：

ExampleUnitTest.java这个文件是每次新建项目的时候就有的，这个文件的作用是可以进行单元测试。

双击addition_isCorrect，右击run就会运行这部分代码

public class ExampleUnitTest {
    @Test
    public void addition_isCorrect() {
        assertEquals(4, 2 + 2);
    }
}

默认的是这个，因为4=2+2，所以不会报错，当你将后面改成3就会报错了，我们可以在下面写函数，然后放在这个函数里面调用，就可以实现单元测试了。

如果你写了一段代码，然后又想把它分离出去当做一个函数，可以使用ctrl+alt+m快捷键，第一个可以选择private,public.....第二个可以写准备取的函数名。

package com.aimee.android.play.junit;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

public class MainActivity extends AppCompatActivity {

    private EditText et_text;
    String text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_text = findViewById(R.id.et_text);
        writeFile();//ctrl+alt+m创建一个方法

        readFile();


    }

    private void readFile() {
        try {
            FileInputStream fis = openFileInput("file.txt");
            File file = new File("file.txt");
            text = file.getAbsolutePath();
            byte[] bytes = new byte[20];
            fis.read(bytes);
            et_text.setText(text);
            fis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 写入文件
     * */
    private void writeFile() {
        //创建一个文件，程序自身可以读写
        try {
            FileOutputStream fos = openFileOutput("file.txt", Context.MODE_PRIVATE);
            fos.write("data111".getBytes());
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

注意：一般android程序的默认安装位置是/data/data/包名，但是这个里面的文件是被保护的，不可以打开，所以如果想要看文件的内容，可以选择路径的时候getExternalFilesDir()   这个路径，它的路径一般是/storage/data/0/android/包名。