android_01_电话拨号器

最新推荐文章于 2021-06-03 06:31:35 发布

原创最新推荐文章于 2021-06-03 06:31:35 发布 · 318 阅读

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本文介绍了一个简单的Android应用程序，该程序使用LinearLayout布局显示文本、输入框和按钮，并通过Intent发起电话拨打。文章展示了如何在AndroidManifest.xml中声明必要的权限，并在MainActivity.java中实现拨号功能。

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界面:

布局(activity_main.xml):

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.xsism.helloworld.MainActivity" >

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
 

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView2"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="33dp"
        android:text="请输入号码:" />

    
    <EditText
        android:id="@+id/editText_phoneNo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="10086"
        />

<Button
    android:id="@+id/dialBtn"
        
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView3"
        android:layout_below="@+id/textView3"
        android:layout_marginTop="21dp"
        android:text="拨号" />


</LinearLayout>

权限(AndroidManifest.xml):

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.xsism.helloworld"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />
    <uses-feature />
    <package-verifier />
    <uses-permission android:name="android.permission.CALL_PHONE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

package com.xsism.helloworld;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.*;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置布局文件
        setContentView(R.layout.activity_main);
        // 获取按钮
        Button btn = (Button)findViewById(R.id.dialBtn);
        // 设置侦听
        btn.setOnClickListener(new BtnListener());
    }
    
    // 内部类
    class BtnListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
//			System.out.println("sg__btn clicked");
//			Toast.makeText(getApplicationContext(), "默认Toast样式",
//				     Toast.LENGTH_SHORT).show();
			
			// 获取输入框
			EditText phoneNoEdit = (EditText) findViewById(R.id.editText_phoneNo);
			String phoneNoStr = phoneNoEdit.getText().toString();
			Toast.makeText(getApplicationContext(), phoneNoStr,
				     Toast.LENGTH_SHORT).show();
			// 配置Intent
			Intent intent = new Intent();
			intent.setAction(Intent.ACTION_CALL);
			intent.setData(Uri.parse("tel:"+phoneNoStr));
			// 启动系统的call_phone (此处应该有权限)
			startActivity(intent);
		}
    	
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}