我创建了dbNote.sqlite（int id，TEXT INDEX）
public class MainActivity extends AppCompatActivity {
TextView txtNote;
Button btnSave,btnDelete;`enter code here
String DATABASE_NAME="dbNote.sqlite";
private static final String DB_PATH_SUFFIX = "/databases/";
SQLiteDatabase database=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
processCopy();
addControls();
addEvents();
ShowPart();
}
private void ShowPart() {
database = openOrCreateDatabase(DATABASE_NAME, MODE_PRIVATE, null);
Cursor cursor = database.query("NOTE", null,null,null,null,null,null);
while (cursor.moveToNext())
{
String note = cursor.getString(1);
txtNote.setText(note);
}
cursor.close();
}
private void addEvents() {
btnSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ContentValues row = new ContentValues();
String index = txtNote.getText().toString();
row.put("INDEX",index);
database.update("NOTE",row,"id=1",null);
ShowPart();
}
});
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ContentValues row = new ContentValues();
row.put("INDEX"," ");
database.update("NOTE",row,"id=1",null);
//ShowPart();
}
});
}
private void addControls() {
txtNote= (TextView) findViewById(R.id.txtNote);
btnSave= (Button) findViewById(R.id.btnSave);
btnDelete= (Button) findViewById(R.id.btnDelete);
}
private void processCopy() {
File dbFile = getDatabasePath(DATABASE_NAME);
if (!dbFile.exists())
{
try
{
CopyDataBaseFromAsset();
}
catch (Exception e)
{
}
}
}
private void CopyDataBaseFromAsset() {
try
{
InputStream myInput=getAssets().open(DATABASE_NAME);
String outFileName = getDatabasePath();
File f = new File(getApplicationInfo().dataDir + DB_PATH_SUFFIX);
if(!f.exists())
{
f.mkdir();
}
OutputStream myOutput = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer)) > 0)
{
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
}
catch (Exception ex)
{
Log.e("Error",ex.toString());
}
}
private String getDatabasePath() {
return getApplicationInfo().dataDir + DB_PATH_SUFFIX+ DATABASE_NAME;
}
}
10-30 14:31:47.877 29101-29101/com.it.titun.testnotedatabase E/SQLiteLog: (1) near "INDEX": syntax error
10-30 14:31:47.877 29101-29101/com.it.titun.testnotedatabase D/AndroidRuntime: Shutting down VM
10-30 14:31:47.877 29101-29101/com.it.titun.testnotedatabase E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.it.titun.testnotedatabase, PID: 29101
android.database.sqlite.SQLiteException: near "INDEX": syntax error (code 1): , while compiling: UPDATE NOTE SET INDEX=? WHERE id=1
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.updateWithOnConflict(SQLiteDatabase.java:1574)
at android.database.sqlite.SQLiteDatabase.update(SQLiteDatabase.java:1522)
at com.it.titun.testnotedatabase.MainActivity$2.onClick(MainActivity.java:67)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)