Android基础--电话拨号器

1.布局文件:

activity_main.xml

<RelativeLayout 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"    tools:context="com.itheima.callphone.MainActivity" >    <EditText        android:id="@+id/et_number"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true"        android:ems="10" >        <requestFocus />    </EditText>    <Button        android:id="@+id/bt_dial"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_below="@+id/et_number"        android:text="@string/_dial" /></RelativeLayout>

2.MainActivity.java

package com.itheima.callphone;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.text.TextUtils;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends ActionBarActivity implements OnClickListener {    //用于输入电话号码的文本框    private EditText et_number;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获得号码文本输入框        et_number = (EditText)findViewById(R.id.et_number);        //获得拨号按钮        Button bt_dial = (Button)findViewById(R.id.bt_dial);        bt_dial.setOnClickListener(this);    }    //实现各种控件的点击事件    @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.bt_dial:            callPhone();            break;        default:            break;        }    }    //实现拨号操作    private void callPhone() {        //获取号码输入框的号码        String number = et_number.getText().toString().trim();        //进行非空判断        if(TextUtils.isEmpty(number)){            //给用户提示            Toast.makeText(MainActivity.this, "号码不能为空", Toast.LENGTH_LONG).show();          return;

        }        //开启拨号服务        Intent intent = new Intent();        intent.setAction(Intent.ACTION_CALL);        intent.setData(Uri.parse("tel:"+number));        startActivity(intent);    }}

3.常见错误

错误描述:

java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.CALL dat=tel:xxx-xxx-xxxx cmp=com.android.phone/.OutgoingCallBroadcaster } from ProcessRecord{b76dbe10 1322:com.itheima.callphone/10032} (pid=1322, uid=10032) requires android.permission.CALL_PHONE

原因:没有给应用程序添加拨号的权限,添加方法如下图.

Android基础--电话拨号器_第2张图片

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