本文打算实现具有一个一键拨号功能的 APP

1.布局文件activity_main.xml

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="cn.sehzh.intenttester.MainActivity" >

android:id="@+id/mCallButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="26dp"

android:text="Call" />

2.MainActivity

package cn.sehzh.intenttester;

import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

private Button mBtn;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mBtn = (Button) findViewById(R.id.mCallButton);

mBtn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

dialPhoneNumber("110");

}

});

}

private void dialPhoneNumber(String phoneNumber) {

Intent intent = new Intent(Intent.ACTION_CALL);

intent.setData(Uri.parse("tel:" + phoneNumber));

if (intent.resolveActivity(getPackageManager()) != null) {

startActivity(intent);

}

}

}3.运行效果

4.注意

Intent intent = new Intent(Intent.ACTION_CALL);中的ACTION_CALL如果写为ACTION_DIAL则会跳出带键盘拨号界面，而不是直接拨打电话；

需要以下权限