第一个Activity（创建数据库）：
Db db = new Db(this);
SQLiteDatabase dbWrite = db.getReadableDatabase();
ContentValues cv = new ContentValues();
cv.put("name", "小张");
cv.put("sex", "男");
dbWrite.insert("user", null, cv);
cv = new ContentValues();
cv.put("name", "小李");
cv.put("sex", "女");
dbWrite.insert("user", null, cv);
dbWrite.close();
第二个Activity（查看数据库内容）：
public class TryAnotherAty extends AppCompatActivity {
private TextView tv = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_try_another_aty);
tv = (TextView) findViewById(R.id.tv);
tv.setMovementMethod(ScrollingMovementMethod.getInstance());
SQLiteDatabase dbRead = openOrCreateDatabase("mytable", Context.MODE_PRIVATE,null);
Cursor c = dbRead.query("user", null, null, null, null, null, null);
while(c.moveToNext()){
tv.append(getString(c.getColumnIndex("name")));
tv.append(getString(c.getColumnIndex("sex")));
tv.append("\n");
}
}
Db.class:
public class Db extends SQLiteOpenHelper {
//必须要有构造函数
public Db(Context context) {
super(context, "db", null, 1);
}
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table user( name TEXT,sex TEXT )");
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
PS：真机测试时跳到第二个Acitvity直接退出程序。
