对,我在这个项目中有一个计数器,它所有的工作,但我试图在屏幕底部放置另一个计数器,它会做同样的事情,但会在另一个计数上工作。所以会有两个计数器计数不同,但由于应用程序保存数据,我无法弄清楚如何去做。
xml代码:
<TextView
android:id="@+id/TextViewCount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="@string/hello_world" />
<Button
android:id="@+id/ButtonCount"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/TextViewCount"
android:layout_alignRight="@+id/TextViewCount"
android:layout_marginBottom="22dp"
android:text="Count" />
主要代码:
package com.example.counter;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
// Private member field to keep track of the count
private static int mCount = 0;
private TextView countTextView;
private Button countButton;
public static final String PREFS_NAME = "com.example.myApp.mCount";
private SharedPreferences settings = null;
private SharedPreferences.Editor editor = null;
/** ADD THIS METHOD **/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
countTextView = (TextView) findViewById(R.id.TextViewCount);
countButton = (Button) findViewById(R.id.ButtonCount);
countButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
mCount++;
countTextView.setText("Count: " + mCount);
editor = settings.edit();
editor.putInt("mCount", mCount);
editor.commit();
}
});
settings = getSharedPreferences(PREFS_NAME, MODE_PRIVATE);
}
@Override
public void onPause() {
super.onPause();
}
@Override
public void onResume() {
super.onResume();
mCount = settings.getInt("mCount", 0);
countTextView.setText("Count: " + mCount);
}
}