android – java.lang.IllegalStateException：找不到方法(View)
作者：互联网
我有一个简单的应用程序,在三个屏幕的每一个上都有一个按钮.
前两个按钮应该将您从一个意图发送到下一个意图,直到最后一个应该拍照并在第三个屏幕上打印的按钮.
但是当我添加相机功能时,应用程序停止工作,现在当我按下第一个“开始spil”按钮时它甚至不会移动到第二个意图.
HomeActivity
package com.example.daniel.proto;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class Home extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
}
public void onClick(View view)
{
Intent i = new Intent(this, SelectLevel.class);
startActivity(i);
}
@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_home, 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);
}
}
SelectLevelActivity
package com.example.daniel.proto;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.content.Intent;
public class SelectLevel extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_level);
}
public void onClick(View view)
{
Intent ii = new Intent (this, QRscanner.class);
startActivity(ii);
}
@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_select_level, 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);
}
}
QRscannerActivity
package com.example.daniel.proto;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.provider.MediaStore;
import android.content.pm.PackageInfo;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class QRscanner extends ActionBarActivity
{
static final int REQUEST_IMAGE_CAPTURE = 1;
ImageView photoImageView;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qrscanner);
Button photoButton = (Button) findViewById(R.id.photoButton);
photoImageView = (ImageView) findViewById(R.id.photoImageView);
//Disable the button if the user doesn't have a camera
if(!hasCamera())
photoButton.setEnabled(false);
}
//Check if the user has a camera
private boolean hasCamera()
{
return getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY);
}
//Launching the camera
public void launchCamera(View view)
{
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//Take a picture and pass results along to onActivityResult
startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
}
//If you want to return the image taken
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK)
{
//Get the photo
Bundle extras = data.getExtras();
Bitmap photo = (Bitmap) extras.get("data");
photoImageView.setImageBitmap(photo);
}
}
}
家庭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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".Home"
android:background="#009900">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Spil"
android:id="@+id/playButton"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:onClick=""
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="QuesteX"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="36dp"
android:textSize="40dp" />
</RelativeLayout>
SelectLevel 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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.daniel.proto.SelectLevel"
android:background="#72231F">
TextView android:text="@string/hello_world" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Udfordringer"
android:id="@+id/titleText"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:textColor="#FFF" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/homeButton"
android:onClick="onClick"
android:layout_below="@+id/titleText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="55dp"
android:layout_marginStart="55dp"
android:layout_marginTop="49dp"
android:text="Click me" />
</RelativeLayout>
QRscanner 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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.daniel.proto.QRscanner"
android:background="#990099">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Take Photo"
android:id="@+id/photoButton"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="65dp"
android:onClick="launchCamera" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/photoImageView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dp"
android:minHeight="300dp"
android:minWidth="300dp" />
</RelativeLayout>
logcat的
05-15 19:41:01.902 2927-2927/com.example.daniel.proto E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.daniel.proto, PID: 2927
java.lang.IllegalStateException: Could not find a method (View) in the activity class com.example.daniel.proto.Home for onClick handler on view class android.support.v7.widget.AppCompatButton with id 'playButton'
at android.view.View$1.onClick(View.java:4007)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NoSuchMethodException: [class android.view.View]
at java.lang.Class.getMethod(Class.java:664)
at java.lang.Class.getMethod(Class.java:643)
at android.view.View$1.onClick(View.java:4000)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
解决方法:
你不小心从android内部删除了方法：onClick按钮.
更改：
android:onClick=""
至：
android:onClick="onClick"
标签：android,xml,android-logcat 来源： https://codeday.me/bug/20190829/1763835.html