码:
package com.example.theball;
import java.util.Timer;
import java.util.TimerTask;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.ActivityInfo;
import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
@SuppressLint("NewApi") public class MainActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;
private Sensor accelerometer;
@SuppressWarnings("unused")
private long lastUpdate;
AnimatedView animatedView = null;
ShapeDrawable mDrawable = new ShapeDrawable();
public static int x;
public static int y;
public static final int width = 50;
public static final int height = 50;
public boolean firstDraw = true;
private int screen_width;
private int screen_height;
private int sensorX;
private Timer t;
private int TimeCounter = 0;
private int sensorY;
private int score = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
accelerometer = sensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
lastUpdate = System.currentTimeMillis();
animatedView = new AnimatedView(this);
setContentView(animatedView);
t=new Timer();
t.scheduleAtFixedRate(new TimerTask() {
public void run() {
runOnUiThread(new Runnable() {
public void run() {
TimeCounter++;
}
});
}
}, 0, 1000);
}
public static class MainActivity extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_main, container, false);
TextView highscore_int = (TextView)v.findViewById(R.id.highscore_int );
SharedPreferences prefs = this.getSharedPreferences("myPrefsKey",
Context.MODE_PRIVATE);
score = prefs.getInt("key", 0);
highscore_int.setText("Highscore:" + score +" seconds.");
return v;
}
@Override
protected void onResume() {
super.onResume();
sensorManager.registerListener(this, accelerometer,
SensorManager.SENSOR_DELAY_GAME);
}
@Override
protected void onPause() {
super.onPause();
sensorManager.unregisterListener(this);
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
sensorY = (int) event.values[1];
sensorX = (int) event.values[0];
x -= sensorX*3;
y += sensorY*3;
if(x <= 0 || x >= screen_width || y <= 0 || y >= screen_height) {
SharedPreferences prefs = this.getSharedPreferences("myPrefsKey", Context.MODE_PRIVATE);
int oldScore = prefs.getInt("key", 0);
if( TimeCounter > oldScore ){
Editor edit = prefs.edit();
edit.putInt("key", TimeCounter);
edit.commit(); }
Intent myIntent = new Intent(this, YouLost.class);
startActivity(myIntent);
}
}
}
public class AnimatedView extends ImageView {
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
static final int width = 50;
static final int height = 50;
@SuppressLint("NewApi")
public AnimatedView(Context context) {
super(context);
// TODO Auto-generated constructor stub
display.getSize(size);
screen_width = size.x;
screen_height = size.y;
mDrawable = new ShapeDrawable(new OvalShape());
mDrawable.getPaint().setColor(0xffffAC23);
mDrawable.setBounds(0, 0, screen_width, screen_height);
}
@Override
protected void onDraw(Canvas canvas) {
mDrawable.setBounds(x, y, x + width, y + height);
if(firstDraw) {
x = screen_width / 2;
y = screen_height / 2;
firstDraw = false;
}
mDrawable.draw(canvas);
invalidate();
}
}
}
我的新问题是，在Eclipse图形布局中，我可以看到文本，但是在我的设备上却看不到文本。
我不知道为什么会这样，无论如何，我的文字设置为黑色，背景为白色，所以这不是问题。
最佳答案
textview highscore_int为空，因为您从highscore_int引用了fragment_main.xml，您将得到null，因为在您的 Activity 中，您正在使用activity's layout
因此，在片段的highscore_int中使用onCreateView可使 View 膨胀
View v = inflater.inflate(R.layout.fragment_main, container, false);
然后使用该 View 查找textview
TextView highscore_int = (TextView)v.findViewById(R.id.highscore_int );
即
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_main, container, false);
TextView highscore_int = (TextView)v.findViewById(R.id.highscore_int );
SharedPreferences prefs = getActivity().getSharedPreferences("myPrefsKey",
Context.MODE_PRIVATE);
score = prefs.getInt("key", 0);
highscore_int.setText("Highscore:" + score +" seconds.");
return v;
}