【发布时间】：2015-12-30 12:32:48
【问题描述】：
我有一个问题，我不明白原因。我正在 Linux 上开发 Android Studio。位图大小为 10x10 像素。我在谷歌搜索，但它什么也没给我。如果有人可以帮助我，我将不胜感激。
这个问题是这样的：
"Bitmap suweren = BitmapFactory.decodeResource(getResources(), R.drawable.suweren);"
这是错误日志：
"12-30 07:16:36.125 9336-9336/com.example.szczesciarz.sawa E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.szczesciarz.sawa, PID: 9336
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.szczesciarz.sawa/com.example.szczesciarz.sawa.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.support.v7.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:98)
at android.support.v7.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:91)
at android.support.v7.app.ToolbarActionBar.<init>(ToolbarActionBar.java:73)
at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:205)
at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:99)
at com.example.szczesciarz.sawa.MainActivity.onCreate(MainActivity.java:19)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
12-30 07:21:36.565 9336-9336/com.example.szczesciarz.sawa I/Process: Sending signal. PID: 9336 SIG: 9"
主要活动代码：
package com.example.szczesciarz.sawa;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new GameView(this));
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@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_main, 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);
}
}
游戏视图代码：
package com.example.szczesciarz.sawa;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.view.View;
class GameView extends View{
public GameView(Context context){
super(context);
}
@Override
public void onDraw(Canvas canvas ){
Bitmap suweren = BitmapFactory.decodeResource(Context.getResources(), R.drawable.suweren);
canvas.drawColor(Color.BLACK);
canvas.drawBitmap(suweren, 0, 0, null);
}
}
谢谢）：-
【问题讨论】：
-
请发布该活动的代码。从日志中，该问题与 ToolbarWidgetWrapper 有关
-
错误似乎在代码的其他部分。分享代码来解决它。
-
这是 GameView.java 的代码
-
包 com.example.szczesciarz.sawa;导入android.content.Context；导入android.graphics.Bitmap；导入android.graphics.BitmapFactory；导入android.graphics.Canvas；导入android.graphics.Color；导入android.view.View；类 GameView 扩展 View{ public GameView(Context context){ super(context); } @Override public void onDraw(Canvas canvas){ Bitmap suweren = BitmapFactory.decodeResource(getResources(), R.drawable.suweren); canvas.drawColor(Color.BLACK); canvas.drawBitmap(suweren, 0, 0, null); } }
-
原谅如此难以辨认，直到我在这里开始帐户。