android.view.InflateException-创建自定义视图的问题 [英] android.view.InflateException - Issues creating custom view
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问题描述
我是android开发的新手，真的很难使用自定义视图.我已经阅读了很多有关SO的内容，它对其他所有方面都非常有帮助，我似乎无法解决这一问题.你们很聪明，非常了解您的东西.我希望有一天可以退还SO，而不是总是服用！任何帮助将不胜感激.谢谢.
I'm new to android development and really struggling with using a custom view. I've read a lot of stuff on SO and its been really helpful with everything else, I just cant seem to work this one out. You guys are very smart and know your stuff so well. I hope to one day give back on SO as opposed to always taking! Any help would be very much appreciated. Thanks.
activity_display_message.xml
activity_display_message.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/share"
/>
<view class="me.myfirstapp.DisplayMessageActivity$MyView"
android:layout_width="150dp"
android:layout_height="100dp"
/>
DisplayMessageActivity.java
DisplayMessageActivity.java
package me.myfirstapp;
import android.os.Bundle;
import android.app.Activity;
import android.util.AttributeSet;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ShareActionProvider;
import android.support.v4.app.NavUtils;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.os.Build;
@SuppressLint({ "NewApi", "DrawAllocation" }) public class DisplayMessageActivity extends Activity {
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// Show the Up button in the action bar.
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
public class MyView extends View {
private int mWidth;
private int mHeight;
public MyView(Context context) {
super(context);
}
public MyView(Context context, AttributeSet attribs) {
super(context, attribs);
}
public MyView(Context context, AttributeSet attribs, int defStyle) {
super(context, attribs, defStyle);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
Bitmap b1=BitmapFactory.decodeResource(getResources(), R.drawable.logolong);
b1 = Bitmap.createScaledBitmap(b1, 100, 20, false);
canvas.drawBitmap(b1, 600, 880, paint);
Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/regencielight.TTF");
paint.setTypeface(tf);
paint.setColor(Color.parseColor("#ffffff"));
paint.setTextSize(46);
canvas.drawText(message, x1, 880, paint);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mWidth = View.MeasureSpec.getSize(widthMeasureSpec);
mHeight = View.MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(mWidth, mHeight);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
logcat输出
03-15 21:14:23.382: E/AndroidRuntime(25443): FATAL EXCEPTION: main
03-15 21:14:23.382: E/AndroidRuntime(25443): Process: me.myfirstapp, PID: 25443
03-15 21:14:23.382: E/AndroidRuntime(25443): java.lang.RuntimeException: Unable to start activity ComponentInfo{me.myfirstapp/me.myfirstapp.DisplayMessageActivity}: android.view.InflateException: Binary XML file line #12: Error inflating class me.myfirstapp.DisplayMessageActivity$MyView
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.ActivityThread.access$800(ActivityThread.java:135)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.os.Handler.dispatchMessage(Handler.java:102)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.os.Looper.loop(Looper.java:136)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-15 21:14:23.382: E/AndroidRuntime(25443): at java.lang.reflect.Method.invokeNative(Native Method)
03-15 21:14:23.382: E/AndroidRuntime(25443): at java.lang.reflect.Method.invoke(Method.java:515)
03-15 21:14:23.382: E/AndroidRuntime(25443): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-15 21:14:23.382: E/AndroidRuntime(25443): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-15 21:14:23.382: E/AndroidRuntime(25443): at dalvik.system.NativeStart.main(Native Method)
03-15 21:14:23.382: E/AndroidRuntime(25443): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class me.myfirstapp.DisplayMessageActivity$MyView
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.view.LayoutInflater.createView(LayoutInflater.java:603)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
03-15 21:14:23.382: E/AndroidRuntime(25443): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.Activity.setContentView(Activity.java:1929)
03-15 21:14:23.382: E/AndroidRuntime(25443): at me.myfirstapp.DisplayMessageActivity.onCreate(DisplayMessageActivity.java:44)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.Activity.performCreate(Activity.java:5231)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-15 21:14:23.382: E/AndroidRuntime(25443): ... 11 more
03-15 21:14:23.382: E/AndroidRuntime(25443): Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
03-15 21:14:23.382: E/AndroidRuntime(25443): at java.lang.Class.getConstructorOrMethod(Class.java:472)
03-15 21:14:23.382: E/AndroidRuntime(25443): at java.lang.Class.getConstructor(Class.java:446)
03-15 21:14:23.382: E/AndroidRuntime(25443): at android.view.LayoutInflater.createView(LayoutInflater.java:568)
03-15 21:14:23.382: E/AndroidRuntime(25443): ... 22 more
推荐答案
如果您将内部类用作自定义视图类，则它必须是 static .充气器没有引用外部类来实例化它.
If you're using an inner class as a custom view class, it must be static. The inflater doesn't have a reference to the outer class to instantiate it.
最好将自定义视图类单独放置，而不要将其作为内部类.
It's better to have your custom view classes on their own and not as inner classes.
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