该功能在紧急呼救按钮中添加onLongClick事件的处理即可。其中Intent.ACTION_CALL_EMERGENCY是紧急呼救的action。
修改文件/frameworks/base/packages/Keyguard/src/com/android/keyguard/EmergencyButton.java
public class EmergencyButton extends Button {
......
@Override
protected void onFinishInflate() {
......
//默认的点击跳转到拨号的代码
setOnClickListener(new OnClickListener() {
public void onClick(View v) {
takeEmergencyCallAction();
}
});
//新加的长按拨号的代码
setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v){
Log.d(TAG, "test_ onLongClick");
takeLongClickEmergencyCallAction();
return true;
}
});
......
/**
* call 112.
*/
public void takeLongClickEmergencyCallAction(){
Log.d(TAG, "test_ takeLongClickCallAction");
String phoneNumber = "112";
Intent intentPhone = new Intent(Intent.ACTION_CALL_EMERGENCY, Uri.parse("tel:" + phoneNumber));
intentPhone.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
getContext().startActivityAsUser(intentPhone,
new UserHandle(mLockPatternUtils.getCurrentUser()));
}
/**
* Shows the emergency dialer or returns the user to the existing call.
*/
public void takeEmergencyCallAction() {
// TODO: implement a shorter timeout once new PowerManager API is ready.
// should be the equivalent to the old userActivity(EMERGENCY_CALL_TIMEOUT)
mPowerManager.userActivity(SystemClock.uptimeMillis(), true);
if (mLockPatternUtils.isInCall()) {
mLockPatternUtils.resumeCall();
} else {
final boolean bypassHandler = true;
KeyguardUpdateMonitor.getInstance(mContext).reportEmergencyCallAction(bypassHandler);
Intent intent = new Intent(ACTION_EMERGENCY_DIAL);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
getContext().startActivityAsUser(intent,
new UserHandle(mLockPatternUtils.getCurrentUser()));
}
}
......
这段代码中使用了Uri，需要import android.net.Uri;