问题
I'm taking a Coursera Android course and am trying to complete an app that I started. I'm trying to get an animation to occur at set intervals. See here for more details
I looked at a lot of posts with the same title, but everyone seems to have different solutions. I don't get an errors in Eclipse when it saves and compiles.
Here's my Logcat results:
02-09 22:56:10.811: E/AndroidRuntime(29538): FATAL EXCEPTION: main
02-09 22:56:10.811: E/AndroidRuntime(29538): Process: stacy.example.assignment3_stacy_v1, PID: 29538
02-09 22:56:10.811: E/AndroidRuntime(29538): java.lang.IllegalStateException: Could not execute method of the activity
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.view.View$1.onClick(View.java:3823)
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.view.View.performClick(View.java:4438)
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.view.View$PerformClick.run(View.java:18422)
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.os.Handler.handleCallback(Handler.java:733)
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.os.Handler.dispatchMessage(Handler.java:95)
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.os.Looper.loop(Looper.java:136)
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.app.ActivityThread.main(ActivityThread.java:5017)
02-09 22:56:10.811: E/AndroidRuntime(29538): at java.lang.reflect.Method.invokeNative(Native Method)
02-09 22:56:10.811: E/AndroidRuntime(29538): at java.lang.reflect.Method.invoke(Method.java:515)
02-09 22:56:10.811: E/AndroidRuntime(29538): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-09 22:56:10.811: E/AndroidRuntime(29538): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-09 22:56:10.811: E/AndroidRuntime(29538): at dalvik.system.NativeStart.main(Native Method)
02-09 22:56:10.811: E/AndroidRuntime(29538): Caused by: java.lang.reflect.InvocationTargetException
02-09 22:56:10.811: E/AndroidRuntime(29538): at java.lang.reflect.Method.invokeNative(Native Method)
02-09 22:56:10.811: E/AndroidRuntime(29538): at java.lang.reflect.Method.invoke(Method.java:515)
02-09 22:56:10.811: E/AndroidRuntime(29538): at android.view.View$1.onClick(View.java:3818)
02-09 22:56:10.811: E/AndroidRuntime(29538): ... 11 more
02-09 22:56:10.811: E/AndroidRuntime(29538): Caused by: java.lang.NumberFormatException: Invalid int: ""
02-09 22:56:10.811: E/AndroidRuntime(29538): at java.lang.Integer.invalidInt(Integer.java:137)
02-09 22:56:10.811: E/AndroidRuntime(29538): at java.lang.Integer.parseInt(Integer.java:358)
02-09 22:56:10.811: E/AndroidRuntime(29538): at java.lang.Integer.parseInt(Integer.java:331)
02-09 22:56:10.811: E/AndroidRuntime(29538): at stacy.example.assignment3_stacy_v1.Assignment3MainActivity.startRhythmandAnimation(Assignment3MainActivity.java:41)
02-09 22:56:10.811: E/AndroidRuntime(29538): ... 14 more
MainActivity.java
package stacy.example.assignment3_stacy_v1;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.EditText;
public class Assignment3MainActivity extends Activity {
private EditText mMileTimeGoal;
private Handler mHandler;
private View mLeftfoot;
private Animation mFootAnim;
private long mInterval = 1000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_assignment3_main);
//mMileTimeGoal = findViewById(R.id.miletimegoal);
mMileTimeGoal = (EditText) findViewById(R.id.miletimegoal);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.assignment3_main, menu);
return true;
}
public void startRhythmandAnimation (View view) {
//String MileTime = mMileTimeGoal.getContext().toString();
String MileTime = mMileTimeGoal.getText().toString();
String[] time_array = MileTime.split(":");
int hours = Integer.parseInt(time_array[0]);
int minutes = Integer.parseInt(time_array[1]);
int seconds = Integer.parseInt(time_array[2]);
int duration = 3600 * hours + 60 * minutes + seconds;
int steps_per_second = 3;
int running_rate = duration * steps_per_second;
/*
View rightfoot = findViewById(R.id.rightfoot);
View leftfoot = findViewById(R.id.leftfoot);
rightfoot.setVisibility(View.VISIBLE);
Animation anim = AnimationUtils.makeInChildBottomAnimation(this);
rightfoot.startAnimation(anim);
leftfoot.setVisibility(View.VISIBLE);
leftfoot.startAnimation(anim);
*/
mHandler = new Handler(); //.os package class when importing
mLeftfoot = findViewById(R.id.leftfoot);
//mFootAnim = AnimationUtils.loadAnimation(this, R.anim.mleftfoot);
mFootAnim = AnimationUtils.loadAnimation(this, R.id.leftfoot);
stepRecursive();
}
private void stepRecursive() {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
mLeftfoot.startAnimation(mFootAnim);
stepRecursive();
}
}, mInterval);
}
public void resetTimetoZeroes () {
String MileTime = mMileTimeGoal.getContext().toString();
//Int MileTime = 0;
}
}
Layout 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=".Assignment3MainActivity" >
<ImageView
android:id="@+id/leftfoot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/rightfoot"
android:layout_toLeftOf="@+id/rightfoot"
android:src="@drawable/leftfoot" />
<EditText
android:id="@+id/miletimegoal"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="18dp"
android:ems="10"
android:inputType="time"
android:hint="Mile Time Goal?" />
<ImageView
android:id="@+id/rightfoot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginBottom="74dp"
android:layout_marginRight="36dp"
android:src="@drawable/rightfoot" />
<Button
android:id="@+id/startbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/leftfoot"
android:layout_alignRight="@+id/leftfoot"
android:onClick="startRhythmandAnimation"
android:text="@string/start_button" />
<Button
android:id="@+id/resetbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/startbutton"
android:layout_alignBottom="@+id/startbutton"
android:layout_alignLeft="@+id/rightfoot"
android:text="@string/reset_button"
android:onClick="resetTimetoZeroes" />
</RelativeLayout>
EDIT - Here's the latest logcat messages. Please ignore the time calculation code. I would like to get the animation working first!
02-09 23:42:32.291: E/AndroidRuntime(32320): FATAL EXCEPTION: main
02-09 23:42:32.291: E/AndroidRuntime(32320): Process: stacy.example.assignment3_stacy_v1, PID: 32320
02-09 23:42:32.291: E/AndroidRuntime(32320): java.lang.IllegalStateException: Could not execute method of the activity
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.view.View$1.onClick(View.java:3823)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.view.View.performClick(View.java:4438)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.view.View$PerformClick.run(View.java:18422)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.os.Handler.handleCallback(Handler.java:733)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.os.Handler.dispatchMessage(Handler.java:95)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.os.Looper.loop(Looper.java:136)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.app.ActivityThread.main(ActivityThread.java:5017)
02-09 23:42:32.291: E/AndroidRuntime(32320): at java.lang.reflect.Method.invokeNative(Native Method)
02-09 23:42:32.291: E/AndroidRuntime(32320): at java.lang.reflect.Method.invoke(Method.java:515)
02-09 23:42:32.291: E/AndroidRuntime(32320): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-09 23:42:32.291: E/AndroidRuntime(32320): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-09 23:42:32.291: E/AndroidRuntime(32320): at dalvik.system.NativeStart.main(Native Method)
02-09 23:42:32.291: E/AndroidRuntime(32320): Caused by: java.lang.reflect.InvocationTargetException
02-09 23:42:32.291: E/AndroidRuntime(32320): at java.lang.reflect.Method.invokeNative(Native Method)
02-09 23:42:32.291: E/AndroidRuntime(32320): at java.lang.reflect.Method.invoke(Method.java:515)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.view.View$1.onClick(View.java:3818)
02-09 23:42:32.291: E/AndroidRuntime(32320): ... 11 more
02-09 23:42:32.291: E/AndroidRuntime(32320): Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x7f090000 type #0x12 is not valid
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.content.res.Resources.loadXmlResourceParser(Resources.java:2314)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.content.res.Resources.getAnimation(Resources.java:963)
02-09 23:42:32.291: E/AndroidRuntime(32320): at android.view.animation.AnimationUtils.loadAnimation(AnimationUtils.java:71)
02-09 23:42:32.291: E/AndroidRuntime(32320): at stacy.example.assignment3_stacy_v1.Assignment3MainActivity.startRhythmandAnimation(Assignment3MainActivity.java:79)
I forgot to post my foot.xml file!
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromYDelta="0" android:toYDelta="-15" android:duration="400"/>
<alpha android:fromAlpha="1.0" android:toAlpha="0" android:duration="400" />
</set>
Fixed my Resource Exception with the following:
mFootAnim = AnimationUtils.loadAnimation(this, R.anim.foot);
回答1:
Your code should be like below to prevent exception
public void startRhythmandAnimation(View view) {
// String MileTime = mMileTimeGoal.getContext().toString();
String MileTime = mMileTimeGoal.getText().toString();
DateFormat formatter = new SimpleDateFormat("HH:mm:ss");
try {
Date dt = formatter.parse(MileTime);
Calendar cal = Calendar.getInstance();
cal.setTime(dt);
int hours = cal.get(Calendar.HOUR);
int minutes = cal.get(Calendar.MINUTE);
int seconds = cal.get(Calendar.SECOND);
int duration = 3600 * hours + 60 * minutes + seconds;
int steps_per_second = 3;
int running_rate = duration * steps_per_second;
mHandler = new Handler(); // .os package class when importing
mLeftfoot = findViewById(R.id.leftfoot);
// mFootAnim = AnimationUtils.loadAnimation(this, R.anim.mleftfoot);
mFootAnim = AnimationUtils.loadAnimation(this, R.id.leftfoot);
stepRecursive();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(Assignment3MainActivity.this,
"Please Enter Valid Time Stamp", Toast.LENGTH_LONG).show();
}
}
回答2:
It seems that when you split MileTime, one of the values in the array is an empty string, judging by the following line:
Caused by: java.lang.NumberFormatException: Invalid int: ""
Put a log statement or breakpoint after you do the split and check the values of time_array to be sure
回答3:
for the 2nd error,Resources$NotFoundException: Resource ID #0x7f090000 type #0x12 is not valid clean the project and see if R.java gets generated again, if not, look at your project folder and see if all files are there
来源：https://stackoverflow.com/questions/21671129/android-illegalstateexception-could-not-execute-method-of-the-activity-cause