Android开发之一个简单实用的小程序
这一个简单实用的小程序包含了短信，电话，定位等多种功能；
但其原理十分简单，界面还有待优化一下；让其更加美观！
界面设计为：
代码：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/asdbf"
tools:context=".MainActivity"
tools:layout_editor_absoluteY="25dp">
<TextView
android:layout_width="111dp"
android:layout_height="39dp"
android:layout_marginTop="76dp"
android:text=" 欢迎使用!"
android:textColor="@color/blueviolet"
android:textSize="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.501"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/iv_pic"
android:layout_width="204dp"
android:layout_height="300dp"
android:layout_marginBottom="17dp"
android:layout_marginStart="32dp"
android:layout_marginTop="32dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/et_1" />
<Button
android:id="@+id/btn_2"
android:layout_width="90dp"
android:layout_height="46dp"
android:layout_marginStart="40dp"
android:layout_marginTop="8dp"
android:background="@drawable/yuanbtn"
android:text="拨打"
android:textColor="@color/blueviolet"
app:layout_constraintStart_toEndOf="@+id/et_1"
app:layout_constraintTop_toTopOf="@+id/et_1" />
<Button
android:id="@+id/btn_1"
android:layout_width="90dp"
android:layout_height="42dp"
android:layout_marginTop="8dp"
android:background="@drawable/yuanbtn"
android:text="联系人"
android:textColor="@color/blueviolet"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@+id/btn_2"
app:layout_constraintTop_toBottomOf="@+id/btn_2"
app:layout_constraintVertical_bias="0.085" />
<Button
android:id="@+id/btn_3"
android:layout_width="87dp"
android:layout_height="44dp"
android:layout_marginTop="28dp"
android:background="@drawable/yuanbtn"
android:text="短信"
android:textColor="@color/blueviolet"
app:layout_constraintEnd_toEndOf="@+id/btn_1"
app:layout_constraintTop_toBottomOf="@+id/btn_1" />
<Button
android:id="@+id/btn_4"
android:layout_width="90dp"
android:layout_height="44dp"
android:layout_marginTop="44dp"
android:background="@drawable/yuanbtn"
android:text="相机"
android:textColor="@color/blueviolet"
app:layout_constraintEnd_toEndOf="@+id/btn_5"
app:layout_constraintTop_toBottomOf="@+id/btn_5" />
<Button
android:id="@+id/btn_5"
android:layout_width="85dp"
android:layout_height="45dp"
android:layout_marginTop="40dp"
android:background="@drawable/yuanbtn"
android:text="地图"
android:textColor="@color/blueviolet"
app:layout_constraintEnd_toEndOf="@+id/btn_3"
app:layout_constraintTop_toBottomOf="@+id/btn_3" />
<EditText
android:id="@+id/et_1"
android:layout_width="206dp"
android:layout_height="44dp"
android:layout_marginBottom="32dp"
android:layout_marginStart="16dp"
android:layout_marginTop="166dp"
android:hint=" 请输入电话号码"
android:inputType="phone"
android:textColorHint="@color/black"
app:layout_constraintBottom_toTopOf="@+id/iv_pic"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
main。activity的代码：
package com.example.wuluo.ways;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.ContactsContract;
import android.provider.MediaStore;
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.ImageView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private EditText et_1;
private String username, usernumber;
// private EditText et_2;
private ImageView iv_pic;
private Button btn_1;//联系人
private Button btn_2;//拨打
private Button btn_3;//短信
private Button btn_4;//相机
private Button btn_5;//地图
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_1 = (EditText) findViewById(R.id.et_1);
iv_pic = findViewById(R.id.iv_pic);
btn_1 = (Button) findViewById(R.id.btn_1);
btn_2 = (Button) findViewById(R.id.btn_2);
btn_3 = (Button) findViewById(R.id.btn_3);
btn_4 = (Button) findViewById(R.id.btn_4);
btn_5 = (Button) findViewById(R.id.btn_5);
btn_1.setOnClickListener(this);
btn_2.setOnClickListener(this);
btn_3.setOnClickListener(this);
btn_4.setOnClickListener(this);
btn_5.setOnClickListener(this);
}
private static int REQUEST_CAMERA = 3;
private static int PICK_CONTACT = 0;
public void onClick(View view) {
//Intent intent = new Intent();
if (view.getId() == R.id.btn_1) {//联系人
Intent intent = new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI);
startActivityForResult(intent, PICK_CONTACT);
} else if (view.getId() == R.id.btn_2) {//拨打电话
Intent intent2 = new Intent();
intent2.setAction(Intent.ACTION_CALL);
intent2.addCategory(Intent.CATEGORY_DEFAULT);
String num = et_1.getText().toString();
intent2.setData(Uri.parse("tel:" + num));
startActivity(intent2);
} else if (view.getId() == R.id.btn_4) {//相机
Intent intent1 = new Intent();
intent1.setAction(MediaStore.ACTION_IMAGE_CAPTURE); //设置动作为调用照相机
startActivityForResult(intent1, 3);//REQUEST_CAMERA请求码
} else if (view.getId() == R.id.btn_3) {//短信
Intent intent = new Intent();
intent.setAction(Intent.ACTION_SENDTO);
intent.setData(Uri.parse("smsto:10086"));
intent.putExtra("sms_body","发个短信！");
startActivity(intent);
}
else if (view.getId() == R.id.btn_5) {
Intent intent5 = new Intent();
Uri uri=Uri.parse("https://m.baidu.com/");
Uri uri1=Uri.parse("geo:39.899533,116.036476");//打开百度地图
intent5.setAction(Intent.ACTION_VIEW);
intent5.setData(uri1);
startActivity(intent5);
}
}
/////在返回函数中
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Bundle bundle = data.getExtras();
if (data == null)
return;
super.onActivityResult(requestCode, resultCode, data);
//Bundle bundle = data.getExtras();// 从data中取出传递回来的数据
switch (requestCode){
case 0:
if (resultCode == Activity.RESULT_OK) {
ContentResolver reContentResolverol = getContentResolver();
Uri contactData = data.getData();
Cursor cursor = managedQuery(contactData, null, null, null, null);
cursor.moveToFirst();
username = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
Cursor phone = reContentResolverol.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId, null, null);
while (phone.moveToNext()) {
usernumber = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
et_1.setText(usernumber + " (" + username + ")");
}
}
break;
case 3:
Bitmap b = (Bitmap) bundle.get("data");//// 将data中的信息流解析为Bitmap类型
iv_pic.setImageBitmap(b);// 显示图片
break;
default:
break;
}
/* else if (requestCode == REQUEST_CAMERA) {//请求码是获得照片
Bitmap b = (Bitmap) bundle.get("data");//// 将data中的信息流解析为Bitmap类型
iv_pic.setImageBitmap(b);// 显示图片
}
*/
}
}
需要添加权限：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.wuluo.ways">
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.WRITE_CONTACTS"/>
<uses-permission android:name="android.permission.READ_CONTACTS"/>
<uses-permission android:name="android.permission.GET_ACCOUNTS"/>
<uses-permission android:name="android.permission.READ_CONTACTS"/>
<application
android:allowBackup="true"
android:icon="@drawable/asccx"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
最后的运行结果：