0
当我试图使用Intent
尝试创建新活动时,我收到的例外等于null
。基本上,当我尝试创建这个新的Activity
时,我的程序终止,即将用户看到的屏幕切换到带有动画宝盒的屏幕(xml中的png文件,它们在从MainActivity运行时起作用)。意向开始活动的空例外
下面是Android Studio中的图片错误我收到:
我开发上的设备运行vr4.0.4一个VUZIX M100应用。
下面是这两个活动我运行:
MainActivity.java
package com.rit.se.treasurehuntvuz;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.util.Log;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
public void onBackPressed() {
try {
Intent showTreasureIntent = new Intent(this, ShowTreasureActivity.class);
startActivity(showTreasureIntent);
}
catch(Exception exception) {
Log.e("MainActivity", exception.getMessage());
}
}
}
ShowTreasureActivity.java
package com.rit.se.treasurehuntvuz;
import android.content.Intent;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
public class ShowTreasureActivity extends AppCompatActivity {
private ImageView treasureImage;
private AnimationDrawable treasureAnimation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_showtreasure);
treasureImage = (ImageView)findViewById(R.id.treasureAnimationView);
treasureImage.setBackgroundResource(R.drawable.anim_treasure);
treasureAnimation = (AnimationDrawable) treasureImage.getBackground();
treasureAnimation.setOneShot(true);
}
@Override
public void onWindowFocusChanged (boolean hasFocus)
{
treasureAnimation.start();
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onRestart() {
super.onRestart();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
public void onBackPressed() {
}
}
异常显示为空的事实看起来更像调试器问题,而不是代码问题。代码看起来很好。 catch块中的日志语句是否显示Logcat中的任何内容?当你点击后退按钮时什么都不会发生?您是否将ShowTreasureActivity添加到您的清单中? –
当我点击后退按钮时程序崩溃。并没有从日志中。而且它是清单文件! – visc
你是否来自同一活动,你是通过回来按? –