嗨，我是新来的android我有这个小应用程序，将主Activity的背景颜色更改为红色..使用Preference framework.but它无法正常工作请帮助
注意：我正在使用Genymotion模拟器
主要活动中的代码
package com.example.prefactivity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
PreferenceManager.setDefaultValues(getApplicationContext(),R.xml.myprefs, false);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
startActivity(new Intent(this,SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
}
代码
package com.example.prefactivity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
public class SettingsActivity extends PreferenceActivity {
final static String RED = "red";
//final static String FONT = "font";
OnSharedPreferenceChangeListener preflistner;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.myprefs);
SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
preflistner = new OnSharedPreferenceChangeListener() {
@Override
public void onSharedPreferenceChanged(SharedPreferences mpref,
String key) {
LayoutInflater inflater = getLayoutInflater();
ViewGroup container = null;
View view=inflater.inflate(R.layout.activity_main, container);
RelativeLayout mylayout = (RelativeLayout)view.findViewById(R.id.myrellayout);
if(key.equals(SettingsActivity.RED)){
boolean color = mpref.getBoolean(SettingsActivity.RED, false);
if(color==true)
mylayout.setBackgroundColor(getResources().getColor(android.R.color.holo_red_light));
else
mylayout.setBackgroundColor(getResources().getColor(android.R.color.background_light));
}
}
};
pref.registerOnSharedPreferenceChangeListener(preflistner);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.settings, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
logcat文件
02-27 10:49:13.300: D/libEGL(1589): loaded /system/lib/egl/libEGL_genymotion.so
02-27 10:49:13.324: D/(1589): HostConnection::get() New Host Connection established 0xb886cf40, tid 1589
02-27 10:49:13.392: D/libEGL(1589): loaded /system/lib/egl/libGLESv1_CM_genymotion.so
02-27 10:49:13.412: D/libEGL(1589): loaded /system/lib/egl/libGLESv2_genymotion.so
02-27 10:49:13.496: W/EGL_genymotion(1589): eglSurfaceAttrib not implemented
02-27 10:49:13.520: E/OpenGLRenderer(1589): Getting MAX_TEXTURE_SIZE from GradienCache
02-27 10:49:13.524: E/OpenGLRenderer(1589): MAX_TEXTURE_SIZE: 16384
02-27 10:49:13.596: E/OpenGLRenderer(1589): Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
02-27 10:49:13.628: E/OpenGLRenderer(1589): MAX_TEXTURE_SIZE: 16384
02-27 10:49:13.628: D/OpenGLRenderer(1589): Enabling debug mode 0
02-27 10:49:25.656: D/dalvikvm(1589): GC_FOR_ALLOC freed 142K, 8% free 3134K/3384K, paused 9ms, total 11ms
02-27 10:49:25.672: D/dalvikvm(1589): GC_FOR_ALLOC freed 6K, 8% free 3225K/3484K, paused 4ms, total 5ms
02-27 10:49:25.700: I/dalvikvm-heap(1589): Grow heap (frag case) to 4.328MB for 1127532-byte allocation
02-27 10:49:25.712: D/dalvikvm(1589): GC_FOR_ALLOC freed <1K, 6% free 4326K/4588K, paused 12ms, total 12ms
02-27 10:49:25.876: W/EGL_genymotion(1589): eglSurfaceAttrib not implemented
02-27 10:49:27.944: W/EGL_genymotion(1589): eglSurfaceAttrib not implemented
02-27 10:49:28.644: I/Choreographer(1589): Skipped 46 frames! The application may be doing too much work on its main thread.
答案 0 :(得分：0)
尝试以这种方式实施OnpreferenceChangeListener 那么你可以在偏好改变时做你想做的事。请参阅示例代码。
Preference.OnPreferenceChangeListener changeListener = new Preference.OnPreferenceChangeListener() {
public boolean onPreferenceChange(Preference preference, Object newValue) {
// Code goes here
return true;
}
};
然后，您尝试通过调用
更改活动的背景颜色View view = this.getWindow().getDecorView();
view.setBackgroundColor(color);
这是完整的代码。
Preference.OnPreferenceChangeListener changeListener = new Preference.OnPreferenceChangeListener() {
public boolean onPreferenceChange(Preference preference, Object newValue) {
changecolor(Color.RED);
return true;
}
};
public void changecolor(int color){
View view = this.getWindow().getDecorView();
view.setBackgroundColor(color);
}
我希望这适合你。