我的应用程序编译没有问题，除了有关游标已弃用的警告外，已部署并正常运行，但在几分钟后停止并询问“再次打开应用程序？”。它可以正确重新打开。
崩溃报告在下面，但我不知道如何解释。 该应用程序是一个简单的数据库，显示钢截面属性。 关于从哪里开始寻找的任何建议都将得到感谢。
这3个活动的代码都在这里 http://silverfernsolutions.com/Code_for_stackoverflow_55308480.txt
最小版本代码如下。我只能在Studio AVD上进行测试，方法是进入DisplaySectionProperties屏幕，然后关闭并打开模拟器。重新打开后，显示将返回到ShowSelectedSource屏幕，有时会触发错误消息。
UPDATE-RESOLVED行时问题消失了
c.close();
mDbHelper.close();
被删除。这意味着使用数据库的方式存在问题，这是另一个问题。
a java.lang.RuntimeException:
at android.app.ActivityThread.performResumeActivity (ActivityThread.java:3790)
at android.app.ActivityThread.handleResumeActivity (ActivityThread.java:3830)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1746)
at android.os.Handler.dispatchMessage (Handler.java:105)
at android.os.Looper.loop (Looper.java:164)
at android.app.ActivityThread.main (ActivityThread.java:6944)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)
Caused by: java.lang.IllegalStateException:
at android.app.Activity.performRestart (Activity.java:7322)
at android.app.Activity.performResume (Activity.java:7353)
at android.app.ActivityThread.performResumeActivity (ActivityThread.java:3765)
代码
public class MainActivity extends AppCompatActivity{
String DB_NAME = "SteelSectionProperties";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setNavigationIcon(R.drawable.icon);
setSupportActionBar(toolbar);
// Display icon in the toolbar
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayUseLogoEnabled(true);
deleteDatabase(DB_NAME); //7Aug2011. Reload each time to pick up any upgrades
DataBaseHelperReign myDbHelper;// = new DataBaseHelperReign(this);
myDbHelper = new DataBaseHelperReign(this);
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
//Toast.makeText(MainActivity.this, "Unable to create DB", Toast.LENGTH_LONG).show();
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
} catch (SQLException sqle) {
//Toast.makeText(MainActivity.this, "Unable to open DB", Toast.LENGTH_LONG).show();
throw sqle;
}
myDbHelper.close();
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String units = prefs.getString("displayunitskey", "1");
if (units == "1") {
//first use. Set mm as initial default setting
SharedPreferences.Editor editor = prefs.edit();
editor.putString("displayunitskey", "mm");
editor.commit();
}
}//end oncreate
public void onClick(View v) {
// Perform action on click
int Idx = 0;
int id = v.getId();
switch (id) {
case R.id.btn0: Idx = 0; break;
case R.id.btn1: Idx = 1; break;
case R.id.btn2: Idx = 2; break;
case R.id.btn3: Idx = 3; break;
case R.id.btn4: Idx = 4; break;
case R.id.btn5: Idx = 5; break;
case R.id.btn6: Idx = 6; break;
case R.id.btn7: Idx = 7; break;
} //end switch
runIntents(Idx);
}//end onClick
/**/
private void runIntents(int idx) {
if (idx == 0) {
//Intent i = new Intent(this, UserSectionInput.class);
//startActivity(i);
} else {
Intent i = new Intent(this, ShowSelectedSource.class);
i.putExtra("ButtonID", idx);
startActivity(i);
} //endif
}//end runintents
}
public class ShowSelectedSource extends ListActivity{
long mSelSectionID;
String mSource, mSourceFile;
String mTable;
private SectionsDbAdapter mDbHelper;
private SectionsUserDbAdapter mDbUserHelper;
private int BtnId;
TextView tv_section, lblListSection;
ImageView imgListSection;
ImageView imgIcon;
Button btn6; //Tee shape
String mSorting ="DESC"; //ASC or DESC (default)
String mShape="A"; //default
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_selected_source);
Bundle bundle = getIntent().getExtras();
BtnId = bundle.getInt("ButtonID");
lblListSection= findViewById(R.id.lblListSection);
imgListSection= findViewById(R.id.imgListSection);
btn6 = findViewById(R.id.btn6);
mDbHelper = new SectionsDbAdapter(this);
mDbUserHelper = new SectionsUserDbAdapter(this);
//Button clicked on opening screen
switch (BtnId){
case 0://custom, already gone in Main to section input screen
case 1: mSource="CU"; mSourceFile="Saved user sections"; break; //user saved sections
case 2: mSource="US"; mSourceFile="American "; break;
case 3: mSource="AU"; mSourceFile="Australian "; break;
case 4: mSource="UK"; mSourceFile="British "; break;
case 5: mSource="EU"; mSourceFile="European "; break;
case 6: mSource="JA"; mSourceFile="Japan "; break;
case 7: mSource="TU"; mSourceFile="Tubes "; break;
}//end switch
if ( BtnId == 1){
mTable="SectionUser";
mDbUserHelper.open();
}else{
mTable="SectionProps";
mDbHelper.open();
btn6.setVisibility(View.GONE); //turn off Tee button
}
initialDisplay();
} // end onCreate ///////////////////////////////////////////////
private void initialDisplay(){
//open display
lblListSection.setText(mSourceFile);
Cursor c=null;
try{
if ( BtnId == 1){
c = mDbUserHelper.fetchRecordsbySource(mTable, mSource);
}else{
c = mDbHelper.fetchRecordsbySourceReverse(mTable, mSource,mSorting);
}
startManagingCursor(c);
} catch (SQLException e){
e.printStackTrace();
}
String[] from = new String[] {SectionsDbAdapter.KEY_DESC }; //The column(s) that the data are from
int[] to = new int[] { R.id.tv_full_width }; // int array containing references to the views that we'll bind the data into (the R.id.text1 TextView).
SimpleCursorAdapter records =
new SimpleCursorAdapter(this, R.layout.section_row_full_width, c, from, to); //the .xml file containing the R.id.xxxx
setListAdapter(records);
//c.close(); don't close, it stuffs up the buttons for some reason
}
private void loadListView(){
setImage();
Cursor c=null;
try{
if (mShape.equals("A")){
if ( BtnId == 1){
c = mDbUserHelper.fetchRecordsbySourceReverse(mTable, mSource,mSorting);
}else{
c = mDbHelper.fetchRecordsbySourceReverse(mTable, mSource, mSorting);
}
}else{
if ( BtnId == 1){
c = mDbUserHelper.fetchRecordsbySourceShapeReverse(mTable, mSource, mShape, mSorting);
}else{
c = mDbHelper.fetchRecordsbySourceShapeReverse(mTable, mSource, mShape, mSorting);
}
}
startManagingCursor(c);
String[] from = new String[] {SectionsDbAdapter.KEY_DESC }; //The column(s) that the data are from
int[] to = new int[] { R.id.tv_full_width }; // int array containing references to the views that we'll bind the data into (the R.id.text1 TextView).
SimpleCursorAdapter records =
new SimpleCursorAdapter(this, R.layout.section_row_full_width, c, from, to); //the .xml file containing the R.id.xxxx
setListAdapter(records);
//c.close(); don't close, it stuffs up the buttons for some reason
} catch (SQLException e){
e.printStackTrace();
}
}//end loadview
//get button clicks for filtering
public void onButtonClick(View v) {
switch ( v.getId()) {
case R.id.btn0: mShape="A" ;break; //all
case R.id.btn1: mShape="I";break;
case R.id.btn2: mShape="["; break;
case R.id.btn3: mShape="[]"; break;
case R.id.btn4: mShape="O";break;
case R.id.btn5: mShape="L";break;
case R.id.btn6: mShape="T";break;
case R.id.btnsort:
if (mSorting.equals("DESC")){
mSorting="ASC";
} else {
mSorting="DESC";
}
break;
} //end switch
loadListView();
}//end onClick buttons
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id); // Get the item that was clicked
v.setBackgroundColor(Color.rgb(127, 255, 0));
// next screen to display properties
Intent i = new Intent(this, DisplaySectionProperties.class);
i.putExtra("ButtonID",BtnId);
i.putExtra("Table",mTable);
i.putExtra("TablerowID", id);
Log.e("in select, Tablerow", " id = " +id);
startActivity(i);
}// end onclick listview
} //end class
public class DisplaySectionProperties extends AppCompatActivity {
private String mTable;
private long mTablerowID;
private int mBtnId;
private String mShape;
private String mDescription;
private double mDepth, mtw,mb1, mt1, mb2, mt2;
private String mDisplayUnits; // the units the user wants displayed
private String mSectionUnits; //the units that mS is currently using
private TextView txtDescription;
private ImageView imgShape;
//The section object
private cSectionProperties mS;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_section_properties);
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setNavigationIcon(R.drawable.icon);
setSupportActionBar(toolbar);
mS= new cSectionProperties();
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences (this);
mDisplayUnits=prefs.getString("displayunitskey","1");
txtDescription= findViewById(R.id.lblDisplaySection);
imgShape= findViewById(R.id.imgDisplaySection);
Bundle bundle = getIntent().getExtras();
mBtnId = bundle != null ? bundle.getInt("ButtonID") : 0;
mTable = bundle != null ? bundle.getString("Table") : null;
mTablerowID= bundle.getLong("TablerowID");
Toast.makeText(this, "Disp Sect TablerowID := " + mTablerowID, Toast.LENGTH_LONG) .show();
if (mTablerowID == 0){
//user input section
mDescription=bundle.getString("Description");
mDepth=bundle.getDouble("Depth");
mtw=bundle.getDouble("tw");
mb1=bundle.getDouble("B1");
mt1=bundle.getDouble("T1");
mb2=bundle.getDouble("B2");
mt2=bundle.getDouble("T2");
mShape=bundle.getString("Shape");
mSectionUnits=bundle.getString("Units");
//createUserSection();
}else{
Cursor c;
try{
if(mTable.equals("SectionUser") ){
SectionsUserDbAdapter mDbHelper = new SectionsUserDbAdapter(this);
mDbHelper.open();
c = mDbHelper.fetchRecordbyID(mTable, mTablerowID+""); //convert int to string (v= v + "")= int V is now string
startManagingCursor(c);
mDescription= c.getString(c.getColumnIndex("Description"));
mDepth= c.getDouble(c.getColumnIndex("Depth"));
mtw = c.getDouble(c.getColumnIndex("tweb_wall"));
mb1= c.getDouble(c.getColumnIndex("Bf1"));
mt1= c.getDouble(c.getColumnIndex("Tf1"));
mb2= c.getDouble(c.getColumnIndex("Bf2"));
mt2= c.getDouble(c.getColumnIndex("Tf2"));
mShape= c.getString(c.getColumnIndex("Shape"));
mSectionUnits= c.getString(c.getColumnIndex("Units"));
c.close();
mDbHelper.close();
//createUserSection();
}else{
// section from the standard DB, mSectionUnits will be mm
SectionsDbAdapter mDbHelper = new SectionsDbAdapter(this);
mDbHelper.open();
c = mDbHelper.fetchRecordbyID(mTable, mTablerowID+""); //convert int to string (v= v + "")= int V is now string
startManagingCursor(c);
mDbHelper.close();
// createSection(c);
c.close();
}
} catch (SQLException e){
e.printStackTrace();
}
}//endif
// displayProperties();
} //end oncreate