安卓专题
在安卓中编程拨打电话案例源码
尽管安卓内建了手工电话呼叫功能,但是在一些场合我们还是需要在应用程序中进行电话呼叫,这很容易通过Intent来实现,为了监视电话设备状态,配合使用PhoneStateListener和 TelephonyManager 类。
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"
tools:context=".MainActivity" >
<EditText
android:id="@+id/phoneNumber"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:hint="Type a number to call..."
android:ems="10"
android:inputType="phone" />
<Button
android:id="@+id/call"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/phoneNumber"
android:layout_marginTop="20dp"
android:text="Call" />
<Button
android:id="@+id/dial"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/call"
android:layout_marginTop="20dp"
android:text="Dial and Call" />
</RelativeLayout>
拨打电话核心代码是:
String uri = "tel:"+number.getText().toString();
Intent dialIntent = new Intent(Intent.ACTION_DIAL, Uri.parse(uri));
ACTION_DIAL是拨打电话功能,URI是电话号码。
‘下面是让电话输入电话号码,然后进行拨打的主活动代码:
public class MainActivity extends Activity {
private Button callBtn;
private Button dialBtn;
private EditText number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
number = (EditText) findViewById(R.id.phoneNumber);
callBtn = (Button) findViewById(R.id.call);
dialBtn = (Button) findViewById(R.id.dial);
// add PhoneStateListener for monitoring
MyPhoneListener phoneListener = new MyPhoneListener();
TelephonyManager telephonyManager =
(TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
// receive notifications of telephony state changes
telephonyManager.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);
callBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
// set the data
String uri = "tel:"+number.getText().toString();
Intent callIntent = new Intent(Intent.ACTION_CALL, Uri.parse(uri));
startActivity(callIntent);
}catch(Exception e) {
Toast.makeText(getApplicationContext(),"Your call has failed...",
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
});
dialBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
String uri = "tel:"+number.getText().toString();
Intent dialIntent = new Intent(Intent.ACTION_DIAL, Uri.parse(uri));
startActivity(dialIntent);
}catch(Exception e) {
Toast.makeText(getApplicationContext(),"Your call has failed...",
Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
});
}
private class MyPhoneListener extends PhoneStateListener {
private boolean onCall = false;
@Override
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
// phone ringing...
Toast.makeText(MainActivity.this, incomingNumber + " calls you",
Toast.LENGTH_LONG).show();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
// one call exists that is dialing, active, or on hold
Toast.makeText(MainActivity.this, "on call...",
Toast.LENGTH_LONG).show();
//because user answers the incoming call
onCall = true;
break;
case TelephonyManager.CALL_STATE_IDLE:
// in initialization of the class and at the end of phone call
// detect flag from CALL_STATE_OFFHOOK
if (onCall == true) {
Toast.makeText(MainActivity.this, "restart app after call",
Toast.LENGTH_LONG).show();
// restart our application
Intent restart = getBaseContext().getPackageManager().
getLaunchIntentForPackage(getBaseContext().getPackageName());
restart.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(restart);
onCall = false;
}
break;
default:
break;
}
}
}
}
在PhoneStateListener中设置权限READ_PHONE_STATE 完成电话呼叫的监视权限:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jdon.android.phonecalltest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="13"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.jdon.android.phonecalltest.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>