我有一个卡片视图，它执行两个功能：开始和停止。按下Start时，Start函数开始，txt变为Stop and Lock Deactivated，如下面的if m（Started）语句所示。
在else语句中，我需要调用一些方法/函数来将cardview的颜色从其原始颜色的绿色更改为红色。
public class LandingPage extends AppCompatActivity implements View.OnClickListener {
private CardView appsCard, parentalControlsCard, customSettingsCard, activateCard, StartStopCard;
private TextView lockStatus, processStatus;
private AlarmManager alarmManager;
private ArrayList<RuleSet> ruleSets = null;
private boolean mStarted = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mainactivity);
lockStatus = (TextView) findViewById(R.id.onOff);
processStatus = (TextView) findViewById(R.id.processStartStop);
alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
final Intent intent = new Intent(LandingPage.this, LockOptionReceiver.class);
SharedPreferences setting = getSharedPreferences("PREFS", 0);
String switcher = setting.getString("lockStatus", "");
setStatus(switcher);
String switcher2 = setting.getString("processStatus" , "");
setProcess(switcher2);
try {
ruleSets = RuleSetList.retrieveRuleSet(this);
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
//Defining Cards on Landing Page
appsCard = (CardView) findViewById(R.id.apps_card);
parentalControlsCard = (CardView) findViewById(R.id.parentalControls_id);
customSettingsCard = (CardView) findViewById(R.id.customSettings);
activateCard = (CardView) findViewById(R.id.activate_id);
StartStopCard = (CardView) findViewById(R.id.StartStopCard);
//Add OnClick Listeners
appsCard.setOnClickListener(this);
parentalControlsCard.setOnClickListener(this);
customSettingsCard.setOnClickListener(this);
activateCard.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (ruleSets.isEmpty()) {
Toast.makeText(LandingPage.this, "You did not create a custom setting.", Toast.LENGTH_SHORT).show();
} else {
PendingIntent pending_start;
PendingIntent pending_stop;
Intent startIntent = new Intent(LandingPage.this, LockOptionReceiver.class);
Intent stopIntent = new Intent(LandingPage.this, LockOptionReceiver.class);
Calendar startTime = new GregorianCalendar();
Calendar endTime = new GregorianCalendar();
String startString = ruleSets.get(0).getStartTime();
String endString = ruleSets.get(0).getEndTime();
String[] startArr = startString.split(":");
String[] endArr = endString.split(":");
startTime.set(Calendar.HOUR_OF_DAY, Integer.parseInt(startArr[0]));
startTime.set(Calendar.MINUTE, Integer.parseInt(startArr[1]));
endTime.set(Calendar.HOUR_OF_DAY, Integer.parseInt(endArr[0]));
endTime.set(Calendar.MINUTE, Integer.parseInt(endArr[1]));
pending_start = PendingIntent.getBroadcast(LandingPage.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
pending_stop = PendingIntent.getBroadcast(LandingPage.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
startIntent.putExtra("status", "start");
stopIntent.putExtra("status", "stop");
Toast.makeText(LandingPage.this, "Your ruleset will start at " + startString, Toast.LENGTH_SHORT).show();
setStatus("Lock Active");
setProcess("Stop");
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, AlarmManager.INTERVAL_DAY, startTime.getTimeInMillis(), pending_start);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, AlarmManager.INTERVAL_DAY, startTime.getTimeInMillis(), pending_stop);
}
}
});
final CardView StartStopCard = (CardView) findViewById(R.id.StartStopCard);
StartStopCard.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mStarted) {
mStarted=false;
SharedPreferences setting = getSharedPreferences("PREFS", 0);
SharedPreferences.Editor editor = setting.edit();
editor.remove("switcher");
editor.remove("switcher2");
editor.remove("lockStatus");
editor.remove("processStatus");
editor.commit();
editor.putString("switcher", "true");
editor.putString("switcher2", "true");
editor.putString("lockStatus", "Lock Active");
editor.putString("processStatus", "Start");
editor.apply();
intent.putExtra("status", "start");
sendBroadcast(intent);
intent.putExtra("processStatus", "start");
sendBroadcast(intent);
String status = setting.getString("lockStatus", "");
setStatus(status);
String processStatus = setting.getString("processStatus" , "");
setProcess(processStatus);
}
else {
mStarted= true;
SharedPreferences setting = getSharedPreferences("PREFS", 0);
SharedPreferences.Editor editor = setting.edit();
editor.remove("switcher");
editor.remove("switcher2");
editor.remove("lockStatus");
editor.remove("processStatus");
editor.commit();
editor.putString("switcher", "false");
editor.putString("switcher2", "false");
editor.putString("lockStatus", "Lock Deactivated");
editor.putString("processStatus", "Stop");
editor.apply();
intent.putExtra("status", "stop");
sendBroadcast(intent);
intent.putExtra("processStatus", "start");
sendBroadcast(intent);
String status = setting.getString("lockStatus", "");
setStatus(status);
String processStatus = setting.getString("processStatus" , "");
setProcess(processStatus);
StartStopCard.setCardBackgroundColor(Color.parseColor("#b70505"));
}
}
});
}
@Override
public void onClick(View v) {
Intent i;
switch (v.getId()) {
case R.id.apps_card:
i = new Intent(this, AppList.class);
startActivity(i);
break;
case R.id.parentalControls_id:
i = new Intent(this, ParentalWelcomeActivity.class);
startActivity(i);
break;
case R.id.customSettings:
i = new Intent(this, ViewRuleSets.class);
startActivity(i);
break;
case R.id.activate_id:
i = new Intent(this, RuleSet.class);
startActivity(i);
break;
default:
break;
}
}
private void setStatus(String s) {
lockStatus.setText(s);
}
private void setProcess(String s) { processStatus.setText(s);}
public void ruleSet(View view) {
Intent intent = new Intent(this, ViewRuleSets.class);
startActivity(intent);
}
}
答案 0 :(得分：0)
setCardBackgroundColor将颜色资源ID视为param而不是Color.parseColor("#b70505")
在card_color中定义colors.xml，就像这样
<color name="card_color">#FF4081</color>
然后致电StartStopCard.setCardBackgroundColor( ContextCompat.getColor(view.getContext(), R.color.card_color))