我有 android surfaceView，我正在尝试向其中添加按钮。 在 surfaceView Canvas 中，我画了一些东西。我有一个线程类可以继续绘图。
package com.androidsurfaceview;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class androidsurfaceview extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button buttonShowHide = (Button)findViewById(R.id.showhide);
final Button buttonDummy = (Button)findViewById(R.id.dummy);
buttonShowHide.setOnClickListener(
new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if(buttonDummy.getVisibility()==View.VISIBLE){
buttonDummy.setVisibility(View.GONE);
}
else{
buttonDummy.setVisibility(View.VISIBLE);
}
}
}
);
线程类
package com.androidsurfaceview;
import android.graphics.Canvas;
import android.view.SurfaceHolder;
public class MySurfaceThread extends Thread {
private SurfaceHolder myThreadSurfaceHolder;
private com.androidsurfaceview.test.MySurfaceView myThreadSurfaceView;
private boolean myThreadRun = false;
public MySurfaceThread(SurfaceHolder surfaceHolder, com.androidsurfaceview.test.MySurfaceView surfaceView) {
myThreadSurfaceHolder = surfaceHolder;
myThreadSurfaceView = surfaceView;
}
public void setRunning(boolean b) {
myThreadRun = b;
}
@Override
public void run() {
// TODO Auto-generated method stub
while(myThreadRun){
Canvas c = null;
try{
c = myThreadSurfaceHolder.lockCanvas(null);
synchronized (myThreadSurfaceHolder){
myThreadSurfaceView.onDraw(c);
}
sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
myThreadSurfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
surfaceView 和绘图类
package com.androidsurfaceview;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class test extends Activity{
// ......
// I do a few things here... with this class test.
public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback{
private MySurfaceThread thread;
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
int cx, cy, offx, offy;
public MySurfaceView(Context context) {
super(context);
// TODO Auto-generated constructor stub
init();
}
public MySurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init();
}
public MySurfaceView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
init();
}
private void init(){
getHolder().addCallback(this);
thread = new MySurfaceThread(getHolder(), this);
setFocusable(true); // make sure we get key events
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(3);
paint.setColor(Color.WHITE);
cx = 0;
cy = 0;
offx = 10;
offy = 10;
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
thread.setRunning(true);
thread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
boolean retry = true;
thread.setRunning(false);
while (retry) {
try {
thread.join();
retry = false;
}
catch (InterruptedException e) {
}
}
}
////Just a simple graphic of moving circle.
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
canvas.drawRGB(0, 0, 0);
canvas.drawCircle(cx, cy, 3, paint);
cx += offx;
if (cx > getWidth() || (cx < 0)){
offx *= -1;
cx += offx;
}
cy += offy;
if (cy > getHeight() || (cy < 0)){
offy *= -1;
cy += offy;
}
}
}
}
这是main.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">
<Button
android:id="@+id/showhide"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Toggle The Another Button Show/Hide" />
<Button
android:id="@+id/dummy"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="a Button" />
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.androidsurfaceview.test.MySurfaceView
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</FrameLayout>
</LinearLayout>
问题: 如果我没有 "MySurfaceView" 作为嵌套类，上面的代码仅 有效。但是对于外部类 "test" 我得到以下错误。如果我删除“类测试” 它工作正常。
错误/崩溃
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): FATAL EXCEPTION: main
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidsurfaceview/com.androidsurfaceview.androidsurfaceview}: **android.view.InflateException: Binary XML file line #20: Error inflating class com.androidsurfaceview.test.MySurfaceView**
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.os.Handler.dispatchMessage(Handler.java:99)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.os.Looper.loop(Looper.java:123)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at java.lang.reflect.Method.invokeNative(Native Method)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at java.lang.reflect.Method.invoke(Method.java:521)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at dalvik.system.NativeStart.main(Native Method)
**04-29 11:43:18.977: ERROR/AndroidRuntime(21832): Caused by: android.view.InflateException: Binary XML file line #20: Error inflating class com.androidsurfaceview.test.MySurfaceView**
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:200)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.Activity.setContentView(Activity.java:1647)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at com.androidsurfaceview.androidsurfaceview.onCreate(androidsurfaceview.java:13)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
任何帮助都会很棒......我坚持这个。
最佳答案
首先，您必须将您的 View 声明为 static 类型，以便即使在没有可用的持有类实例时也能对其进行扩充:
public static class MySurfaceView extends SurfaceView
implements SurfaceHolder.Callback
线
<com.androidsurfaceview.test.MySurfaceView
在您的布局 xml 中，MySurfaceView 类位于 com.androidsurfaceview.test 包内，并试图从那里对其进行膨胀，这是错误的。
在您的布局中，您应该遵循package.class$innerclass 声明形式。
但是因为"$"是非法字符，你不能写
<com.androidsurfaceview.test$MySurfaceView
因此您必须在布局 xml 中指定您的 View ，如下所示:
<view class="com.androidsurfaceview.test$MySurfaceView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
这样就可以了。
关于Android:崩溃:二进制 XML 文件行:错误膨胀类(使用 SurfaceView)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5828801/