如何在應用程序（活動）仍在運行時刷新？

我剛剛提出了一個要求添加問題的應用程序。我想刷新整個應用程序，我該怎麼做？我只需要知道如何刷新它 - 這些問題，我可以自己找出來的。如何在應用程序（活動）仍在運行時刷新？

什麼我的目標僅僅是在屏幕返回到開始屏幕，而不是應用程序自行關閉，然後重新啓動（如果這是什麼，這是可用的唯一途徑）

的java：

package com.example.android.mathapp; 

import android.content.pm.ActivityInfo; 
import android.graphics.drawable.AnimationDrawable; 
import android.media.Image; 
import android.os.Build; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.animation.TranslateAnimation; 
import android.widget.ImageView; 
import android.widget.TextView; 

import java.util.Random; 

public class MainActivity extends AppCompatActivity{ 
private boolean correct; 
private String questionTxt, option1String, option2String, option3String, option4String; 
private int answer; 
TextView option1Text, option2Text, option3Text, option4Text; 
private String[] ansString = new String[4]; 
private int counter = 0; 
float f = 100; 

public void correctAnswer() 
{ 
    int first = (int)(Math.random() * 10); 
    int second = (int)(Math.random() * 10); 
    answer = first + second; 
    questionTxt = first + " + " + second + " = ?"; 
} 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_NOSENSOR); 

    /*ImageView rocketImage = (ImageView) findViewById(R.id.img_animation); 
    rocketImage.setBackgroundResource(R.drawable.greencartooncar); 
    rocketAnimation = (AnimationDrawable) rocketImage.getBackground();*/ 

    TextView questionText = (TextView)findViewById(R.id.question); 
    correctAnswer(); 
    questionText.setText(questionTxt + ""); 
    TextView directionsEnd = (TextView)findViewById(R.id.directions); 
    directionsEnd.setText("Get 10 questions right to finish the race!"); 
    makeOptions(answer); 
    option1Text = (TextView)findViewById(R.id.option1); 
    option1Text.setText(ansString[0]); 
    option2Text = (TextView)findViewById(R.id.option2); 
    option2Text.setText(ansString[1]); 
    option3Text = (TextView)findViewById(R.id.option3); 
    option3Text.setText(ansString[2]); 
    option4Text = (TextView)findViewById(R.id.option4); 
    option4Text.setText(ansString[3]); 
    setString(); 
    //noSameAnswer(); 
} 

private String[] makeOptions(int correctAns) { 

    for(int i=0;i<ansString.length;i++) 
    { 
     ansString[i] = null; 
    } 

    int randomPos = (new Random().nextInt(4 - 1) + 1); 
    ansString[randomPos]=correctAns + ""; 

    for (int i=0;i<4;i++){ 
     int randomAns = (int)(Math.random() * 10 + Math.random() * 10); 
     if(ansString[i] == null){ 
      ansString[i]=randomAns + ""; 
     } 
    } 

    if (ansString[0].equals(ansString[1])||ansString[0].equals(ansString[2])||ansString[0].equals(ansString[3]) 
      ||ansString[1].equals(ansString[2]) ||ansString[1].equals(ansString[3])||ansString[2].equals(ansString[3])) 
    { 
     makeOptions(answer); 
    } 

    return ansString; 
} 

/*public void noSameAnswer() 
{ 
    if (option1String.equals(option2String)||option1String.equals(option3String)||option1String.equals(option4String) 
      ||option2String.equals(option3String)||option2String.equals(option4String)||option3String.equals(option4String)) 
    { 
     makeOptions(answer); 
     option1Text = (TextView)findViewById(R.id.option1); 
     option1Text.setText(ansString[0]); 
     option2Text = (TextView)findViewById(R.id.option2); 
     option2Text.setText(ansString[1]); 
     option3Text = (TextView)findViewById(R.id.option3); 
     option3Text.setText(ansString[2]); 
     option4Text = (TextView)findViewById(R.id.option4); 
     option4Text.setText(ansString[3]); 
     setString(); 
     noSameAnswer(); 
    } 
}*/ 

public void onClick3(View v) { 
    if (option3String.equals(Integer.toString(answer))) { 
     counter++; 
     TextView questionText = (TextView) findViewById(R.id.question); 
     correctAnswer(); 
     questionText.setText(questionTxt + ""); 
     makeOptions(answer); 
     option1Text = (TextView)findViewById(R.id.option1); 
     option1Text.setText(ansString[0]); 
     option2Text = (TextView)findViewById(R.id.option2); 
     option2Text.setText(ansString[1]); 
     option3Text = (TextView)findViewById(R.id.option3); 
     option3Text.setText(ansString[2]); 
     option4Text = (TextView)findViewById(R.id.option4); 
     option4Text.setText(ansString[3]); 
     setString(); 
     animate(); 
     //noSameAnswer(); 
    } 
} 

public void onClick1(View v) { 
    if (option1String.equals(Integer.toString(answer))) { 
     counter++; 
     TextView questionText = (TextView) findViewById(R.id.question); 
     correctAnswer(); 
     questionText.setText(questionTxt + ""); 
     makeOptions(answer); 
     option1Text = (TextView)findViewById(R.id.option1); 
     option1Text.setText(ansString[0]); 
     option2Text = (TextView)findViewById(R.id.option2); 
     option2Text.setText(ansString[1]); 
     option3Text = (TextView)findViewById(R.id.option3); 
     option3Text.setText(ansString[2]); 
     option4Text = (TextView)findViewById(R.id.option4); 
     option4Text.setText(ansString[3]); 
     setString(); 
     animate(); 
     //noSameAnswer(); 
    } 
} 

public void onClick2(View v) { 
    if (option2String.equals(Integer.toString(answer))) { 
     counter++; 
     TextView questionText = (TextView) findViewById(R.id.question); 
     correctAnswer(); 
     questionText.setText(questionTxt + ""); 
     makeOptions(answer); 
     option1Text = (TextView)findViewById(R.id.option1); 
     option1Text.setText(ansString[0]); 
     option2Text = (TextView)findViewById(R.id.option2); 
     option2Text.setText(ansString[1]); 
     option3Text = (TextView)findViewById(R.id.option3); 
     option3Text.setText(ansString[2]); 
     option4Text = (TextView)findViewById(R.id.option4); 
     option4Text.setText(ansString[3]); 
     setString(); 
     animate(); 
     //noSameAnswer(); 
    } 
} 

public void onClick4(View v) { 
    if (option4String.equals(Integer.toString(answer))) { 
     counter++; 
     TextView questionText = (TextView) findViewById(R.id.question); 
     correctAnswer(); 
     questionText.setText(questionTxt + ""); 
     makeOptions(answer); 
     option1Text = (TextView)findViewById(R.id.option1); 
     option1Text.setText(ansString[0]); 
     option2Text = (TextView)findViewById(R.id.option2); 
     option2Text.setText(ansString[1]); 
     option3Text = (TextView)findViewById(R.id.option3); 
     option3Text.setText(ansString[2]); 
     option4Text = (TextView)findViewById(R.id.option4); 
     option4Text.setText(ansString[3]); 
     setString(); 
     animate(); 
     //noSameAnswer(); 
    } 
} 

public void setString() 
{ 
    option1String = option1Text.getText().toString(); 
    option2String = option2Text.getText().toString(); 
    option3String = option3Text.getText().toString(); 
    option4String = option4Text.getText().toString(); 
} 

public void animate() 
{ 
    ImageView img_animation = (ImageView) findViewById(R.id.car); 

    TranslateAnimation animation = new TranslateAnimation(f - 100, f, 
      0.0f, 0.0f); 
    animation.setDuration(1000); 
    animation.setFillAfter(true); 
    img_animation.startAnimation(animation); 
    f += 100; 
} 
}

XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/activity_main" 
android:screenOrientation="portrait" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:background="@color/bigboi" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="com.example.android.mathapp.MainActivity">

- >

<TextView 
    android:id="@+id/option3" 
    android:layout_width="175dp" 
    android:layout_height="120dp" 
    android:background = "@drawable/rounded_corner" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentLeft="true" 
    android:textAppearance="?android:textAppearanceLarge" 
    android:gravity="center" 
    android:layout_marginTop="5dp" 
    android:layout_marginRight="5dp" 
    android:screenOrientation="portrait" 
    android:onClick="onClick3" 
    android:clickable="true" 
    android:text="option 3" /> 

<TextView 
    android:id="@+id/option1" 
    android:text="option 1" 
    android:layout_width="175dp" 
    android:layout_height="120dp" 
    android:background = "@drawable/rounded_corner" 
    android:textAppearance="?android:textAppearanceLarge" 
    android:gravity="center" 
    android:screenOrientation="portrait" 
    android:layout_above="@+id/option3" 
    android:onClick="onClick1" 
    android:clickable="true"/> 

<TextView 
    android:id="@+id/option2" 
    android:layout_width="175dp" 
    android:layout_height="120dp" 
    android:background = "@drawable/rounded_corner" 
    android:textAppearance="?android:textAppearanceLarge" 
    android:gravity="center" 
    android:text="option 2" 
    android:screenOrientation="portrait" 
    android:layout_above="@+id/option3" 
    android:layout_toRightOf="@+id/option3" 
    android:onClick="onClick2" 
    android:clickable="true"/> 

<ImageView 
    android:id="@+id/car" 
    android:layout_width="60dp" 
    android:layout_height="30dp" 
    android:src="@drawable/greencartooncar" 
    android:layout_alignParentTop="true" /> 

<TextView 
    android:id="@+id/option4" 
    android:layout_width="175dp" 
    android:layout_height="120dp" 
    android:background = "@drawable/rounded_corner" 
    android:textAppearance="?android:textAppearanceLarge" 
    android:gravity="center" 
    android:text="option 4" 
    android:layout_alignParentBottom="true" 
    android:layout_toRightOf="@+id/option3" 
    android:layout_toEndOf="@+id/option3" 
    android:screenOrientation="portrait" 
    android:onClick="onClick4" 
    android:clickable="true"/> 

<TextView 
    android:id="@+id/question" 
    android:background="@color/colorAccent" 
    android:layout_width="match_parent" 
    android:layout_height="50dp" 
    android:gravity="center" 
    android:layout_above="@+id/option1" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginBottom="11dp" 
    android:textSize="30sp" 
    android:screenOrientation="portrait"/> 
<TextView 
    android:id="@+id/directions" 
    android:layout_width="match_parent" 
    android:layout_height="60dp" 
    android:gravity="center" 
    android:layout_above="@id/question" 
    android:textSize="15sp"/> 
<ImageView 
    android:id="@+id/finish" 
    android:layout_width="50dp" 
    android:layout_height="75dp" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentRight="true" 
    android:src="@drawable/finish"/> 
<TextView 
    android:layout_width="20dp" 
    android:layout_height="10dp" 
    android:layout_above="@+id/directions" 
    android:layout_alignParentRight="true" 
    android:text="FINISH" 
    android:layout_below="@+id/finish" 
    android:layout_alignLeft="@+id/finish" 
    android:layout_alignStart="@+id/finish" />

來源

2016-12-31 Larry Jing

你的意思是刷新，對嗎？另外，添加你的代碼。 –

我們能否看到您的代碼，以便我們知道需要在「重新啓動」時重置哪些內容？ –

@Nilesh Singh沒有作者批准，但審稿人，我認爲你是通過添加你自己的話來編輯它並獲得批准，因爲答案可能會有所不同取決於這些words.For他想刷新然後他不想**回到開始屏幕** –

如果你想它調用不同的活動創建一個靜態方法，您可以使用此代碼

 Intent mStartActivity = new Intent(YourCurrActivity.this, ClassYouNeedToReLaunch.class); 
     int mPendingIntentId = 123456; 
     PendingIntent mPendingIntent = PendingIntent.getActivity(YourCurrActivity.this, mPendingIntentId, mStartActivity, PendingIntent.FLAG_CANCEL_CURRENT); 
     AlarmManager am = (AlarmManager)YourCurrActivity.this.getSystemService(Context.ALARM_SERVICE); 
     am.set(AlarmManager.RTC, System.currentTimeMillis() + 100, mPendingIntent);

，

import android.app.AlarmManager; 
import android.app.PendingIntent; 
import android.content.Context; 
import android.content.Intent; 


public class Util { 

    static void reStartActivity(Context currant, Class needToLoad){ 
     Intent mStartActivity = new Intent(currant,needToLoad); 
     int mPendingIntentId = 123456; 
     PendingIntent mPendingIntent = PendingIntent.getActivity(currant, mPendingIntentId,mStartActivity, PendingIntent.FLAG_CANCEL_CURRENT); 
     AlarmManager mgr = (AlarmManager)currant.getSystemService(Context.ALARM_SERVICE); 
     mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 100, mPendingIntent); 
    } 
}

，並調用它在任何類，Util.reStartActivity(YourCurrActivity.this,ClassYouNeedToReLaunch.class);

可能是你的問題。

或

如果你有splashActivity什麼similler再打電話來該活動使用正常Intent。

來源

2016-12-31 02:28:20

因此，如果我使用第一個代碼段並將其放入方法中，一旦調用該方法，應用程序將像剛剛運行一樣刷新？ –

test.this.getsystemservice不起作用 –

@Larry Jing它的'WhatEverYourActivityName.this'。我不小心把它作爲Test.this病變它 –

如何在應用程序（活動）仍在運行時刷新？

回答

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