设置背景图片不能正常工作

Question

我想设置为相对布局的背景图像，但有些错误发生 这里是事先我的代码感谢

relative_topheader = new RelativeLayout(this); 
relative_topheader.setId(1); 
RelativeLayout.LayoutParams lp_topheader = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,RelativeLayout.LayoutParams.WRAP_CONTENT); 
Resources resources_topheader = getResources(); 
Drawable drawable_topheader = resources_topheader.getDrawable(R.drawable.headerbar_m); 
relative_topheader.setBackground(drawable_topheader); 
setContentView(1); 

我的日志猫：

05-21 11:40:05.655: I/dalvikvm(510): Could not find method android.widget.RelativeLayout.setBackground, referenced from method com.example.metromatineeapplicationlayer.MainActivity.onCreate 
05-21 11:40:05.698: W/dalvikvm(510): VFY: unable to resolve virtual method 3324: Landroid/widget/RelativeLayout;.setBackground (Landroid/graphics/drawable/Drawable;)V 
05-21 11:40:05.698: D/dalvikvm(510): VFY: replacing opcode 0x6e at 0x0052 
05-21 11:40:05.788: D/AndroidRuntime(510): Shutting down VM 
05-21 11:40:05.788: W/dalvikvm(510): threadid=1: thread exiting with uncaught exception (group=0x40014760) 
05-21 11:40:05.795: E/AndroidRuntime(510): FATAL EXCEPTION: main 
05-21 11:40:05.795: E/AndroidRuntime(510): java.lang.NoSuchMethodError: android.widget.RelativeLayout.setBackground 
05-21 11:40:05.795: E/AndroidRuntime(510): at com.example.metromatineeapplicationlayer.MainActivity.onCreate(MainActivity.java:60) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1712) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1764) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.app.ActivityThread.access$1500(ActivityThread.java:122) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1002) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.os.Handler.dispatchMessage(Handler.java:99) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.os.Looper.loop(Looper.java:132) 
05-21 11:40:05.795: E/AndroidRuntime(510): at android.app.ActivityThread.main(ActivityThread.java:4025) 
05-21 11:40:05.795: E/AndroidRuntime(510): at java.lang.reflect.Method.invokeNative(Native Method) 
05-21 11:40:05.795: E/AndroidRuntime(510): at java.lang.reflect.Method.invoke(Method.java:491) 
05-21 11:40:05.795: E/AndroidRuntime(510): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
05-21 11:40:05.795: E/AndroidRuntime(510): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
05-21 11:42:44.945: E/AndroidRuntime(546): FATAL EXCEPTION: main 
05-21 11:42:44.945: E/AndroidRuntime(546): java.lang.NoSuchMethodError: android.widget.RelativeLayout.setBackground 
05-21 11:42:44.945: E/AndroidRuntime(546): at com.example.metromatineeapplicationlayer.MainActivity.onCreate(MainActivity.java:60) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1712) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1764) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.app.ActivityThread.access$1500(ActivityThread.java:122) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1002) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.os.Handler.dispatchMessage(Handler.java:99) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.os.Looper.loop(Looper.java:132) 
05-21 11:42:44.945: E/AndroidRuntime(546): at android.app.ActivityThread.main(ActivityThread.java:4025) 
05-21 11:42:44.945: E/AndroidRuntime(546): at java.lang.reflect.Method.invokeNative(Native Method) 
05-21 11:42:44.945: E/AndroidRuntime(546): at java.lang.reflect.Method.invoke(Method.java:491) 
05-21 11:42:44.945: E/AndroidRuntime(546): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 
05-21 11:42:44.945: E/AndroidRuntime(546): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 
05-21 11:42:44.945: E/AndroidRuntime(546): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

你的错误说，有没有一种方法找到setBackground你必须relativeLayout

使用

relative_topheader.setBackgroundDrawable (drawable_topheader); 

这将有助于

Answer 2

试试这个代码

public void getpath() { 
 
\t \t File f = new File(new ImageLoader().fullPath + "/desiredFilename.png"); 
 
\t \t if (f.exists()) { 
 

 
\t \t \t Bitmap bitmap = BitmapFactory.decodeFile(f.getAbsolutePath()); 
 
\t \t \t Resources res = this.getResources(); 
 
\t \t \t BitmapDrawable bitmapDrawable = new BitmapDrawable(res, bitmap); 
 
\t \t \t int sdk = android.os.Build.VERSION.SDK_INT; 
 
\t \t \t System.out.println(sdk); 
 
\t \t \t if (sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) { 
 
\t \t \t \t System.out.println("less"); 
 
\t \t \t \t bg.setBackgroundDrawable(bitmapDrawable); 
 

 
\t \t \t } else { 
 
\t \t \t \t System.out.println("great"); 
 
\t \t \t \t bg.setBackground(bitmapDrawable); 
 

 
\t \t \t } 
 
\t \t } else { 
 
\t \t \t bg.setBackgroundDrawable(getResources().getDrawable(
 
\t \t \t \t \t R.drawable.phils)); 
 
\t \t } 
 

 
\t }

Answer 3

试试这一个。

if (Build.VERSION.SDK_INT >= 16) { 
    relative_topheader.setBackground(drawable_topheader); //Added after API 16 
} else { 
    relative_topheader.setBackgroundDrawable(drawable_topheader); // Deprecated after API 16 
}