我执行代码时看到了这个错误：
E/InstantRun: Failed to update existing theme for activity com.example.android.getup.MainActivity@1ebe5a1
java.lang.NoSuchFieldException: No field mTheme in class Landroid/content/res/Resources$Theme; (declaration of 'android.content.res.Resources$Theme' appears in /system/framework/framework.jar)
at java.lang.Class.getDeclaredField(Native Method)
at com.android.tools.fd.runtime.MonkeyPatcher.monkeyPatchExistingResources(MonkeyPatcher.java:374)
at com.android.tools.fd.runtime.Server.restart(Server.java:523)
at com.android.tools.fd.runtime.Server.access$600(Server.java:61)
at com.android.tools.fd.runtime.Server$SocketServerReplyThread.handle(Server.java:318)
at com.android.tools.fd.runtime.Server$SocketServerReplyThread.run(Server.java:190)
at com.android.tools.fd.runtime.Server$SocketServerThread.run(Server.java:158)
at java.lang.Thread.run(Thread.java:761)
一般情况下，应用程序是一个警报应用程序，如果它很重要，它叫做GetUp
package com.example.android.getup;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import com.example.android.getup.Animations.ResizeAnimation;
import com.example.android.getup.Interfaces.FragmentCommunicator;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class MainActivity extends AppCompatActivity implements FragmentCommunicator{
private TextView displayTime, displayMonthYear, displayDayName;
BroadcastReceiver _broadcastReceiver;
private final SimpleDateFormat _sdfWatchTime = new SimpleDateFormat("HH.mm");
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialization
displayTime = (TextView) findViewById(R.id.display_time);
displayMonthYear = (TextView) findViewById(R.id.display_month_year);
displayDayName = (TextView) findViewById(R.id.display_day_name);
// Setting up the day of the month
displayTime.setText(_sdfWatchTime.format(new Date()));
displayMonthYear.setText(new SimpleDateFormat("MMM dd, yyyy").format(System.currentTimeMillis()));
setDisplayDayName();
// The coolest button ever :)
final FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
final View myView = findViewById(R.id.ll_reveal);
myView.setVisibility(View.INVISIBLE);
/**
*
* When the fab is clicked
*
* **/
fab.setOnClickListener(new View.OnClickListener() {
boolean expandOrCollapse = true; // Seeing if adding alarm panel needs to be extended or collapsed
@Override
public void onClick(View view) {
if (expandOrCollapse) { // If the panel is extended
ResizeAnimation.expand(myView); // Expand animation
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
fab.setImageDrawable(getResources().getDrawable(R.drawable.ic_clear_white_48dp, MainActivity.this.getTheme())); // Changing the fab's icon
} else {
fab.setImageDrawable(getResources().getDrawable(R.drawable.ic_clear_white_48dp));
}
expandOrCollapse = false; // Next time the fab is clicked, it'll collapse the add alarm panel
}else{
ResizeAnimation.collapse(myView);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
fab.setImageDrawable(getResources().getDrawable(R.drawable.ic_alarm_add_white_48dp, MainActivity.this.getTheme()));
} else {
fab.setImageDrawable(getResources().getDrawable(R.drawable.ic_alarm_add_white_48dp));
}
expandOrCollapse = true;
}
}
});
}
/**
* The system will send this broadcast event at the exact beginning of every minutes based on system clock.
**/
@Override
public void onStart() {
super.onStart();
_broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context ctx, Intent intent) {
if (intent.getAction().compareTo(Intent.ACTION_TIME_TICK) == 0)
displayTime.setText(_sdfWatchTime.format(new Date()));
};
registerReceiver(_broadcastReceiver, new IntentFilter(Intent.ACTION_TIME_TICK));
}
@Override
public void onStop() {
super.onStop();
if (_broadcastReceiver != null)
unregisterReceiver(_broadcastReceiver);
}
private void setDisplayDayName(){
String Day = "";
switch (Calendar.getInstance().get(Calendar.DAY_OF_WEEK)){
case 1: Day = "Sunday"; break;
case 2: Day = "Monday"; break;
case 3: Day = "Tuesday"; break;
case 4: Day = "Wednesday"; break;
case 5: Day = "Thursday"; break;
case 6: Day = "Friday"; break;
case 7: Day = "Saturday"; break;
}
displayDayName.setText(Day);
}
@Override
public void response(String[] alarmInfo) {
AlarmsListFragment alarmsListF = (AlarmsListFragment) getFragmentManager().findFragmentById(R.id.alarm_box_container_fragment);
alarmsListF.onRecvData(alarmInfo);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
如果您需要更多代码，请告诉我，因为我不确定是什么。