我正在尝试这样做，以便一旦用户将名称输入给定的EditText，然后从主菜单访问猜谜游戏，它会将您重定向到新的活动，在这种情况下猜猜游戏，但它不会遗留信息到TextView。
这是我的GameMenu.java代码：
public class GameMenu extends Activity {
private static final int REQUEST_CODE = 10;
// TextViews
TextView Help;
// String's
String GameSelec;
//Intent
Intent Intent;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gamemenu);
Help = (TextView) findViewById(R.id.TextHelp);
Help.setVisibility(View.INVISIBLE);
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menuoptions, menu);
return true;
}
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.
switch (item.getItemId()) {
case R.id.help:
Help = (TextView) findViewById(R.id.TextHelp);
Help.setText("Enter your name and Select game to play");
Help.setVisibility(View.VISIBLE);
Handler handle = new Handler();
handle.postDelayed(new Runnable() {
@Override
public void run() {
Help.setVisibility(View.INVISIBLE);
}
}, 10000);
return true;
case R.id.GuesGame:
Toast.makeText(this, "Redirecting Now",
Toast.LENGTH_LONG).show();
Intent myIntent = new Intent(GameMenu.this, GuessGame.class);
EditText EditName = (EditText) findViewById(R.id.EditName);
myIntent.putExtra("Name", EditName.getText().toString());
startActivityForResult(myIntent, REQUEST_CODE);
return true;
case R.id.Game2:
Toast.makeText(this, "In Development",
Toast.LENGTH_LONG).show();
return true;
case R.id.Game3:
Toast.makeText(this, "In Development",
Toast.LENGTH_LONG).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
然后这是我的gamemenu.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".GameMenu" >
<GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:alignmentMode="alignBounds"
android:columnCount="2"
android:columnOrderPreserved="false"
android:rowCount="14"
android:useDefaultMargins="true" >
<TextView
android:id="@+id/Gamemenu"
android:layout_column="1"
android:layout_gravity="center_horizontal|top"
android:layout_row="1"
android:text="Game Menu: Follow Instructions"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/GameInsruct"
android:layout_column="1"
android:layout_gravity="center_horizontal|top"
android:layout_row="2"
android:text="Please enter name and select game"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/EditName"
android:layout_column="1"
android:layout_gravity="left|top"
android:layout_row="3"
android:ems="10"
android:hint="Your name here"
android:inputType="textPersonName" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/TextMessage"
android:layout_column="1"
android:layout_gravity="center"
android:layout_row="13"
android:text=""
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/TextHelp"
android:layout_column="1"
android:layout_gravity="center_horizontal|top"
android:layout_row="13"
android:text="Help"
android:textAppearance="?android:attr/textAppearanceMedium" />
</GridLayout>
</LinearLayout>
然后GuessGame.java：
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class GuessGame extends Activity {
// TextViews
TextView Welcome;
TextView Txtname;
TextView Txtnumber;
// EditViews
EditText EdtName;
EditText EditNum1;
EditText EditNum2;
EditText EditGuess;
// Buttons
Button BtnDisp;
// RadioGroup-Related
private RadioGroup radioGroup;
private RadioButton easy, medium, hard;
// int's
int Max;
int max;
int random;
int Attempts;
int guess;
int num1;
// Strings
String name;
String result;
String Strngnum1;
String NameExtra;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.game);
Intent Intent = getIntent();
if (Intent.hasExtra(NameExtra)){
TextView setName = (TextView) findViewById(R.id.EdtName);
String NameExtra = Intent.getStringExtra("Player");
setName.setText("Player:" + NameExtra + "Have Fun");
}
//name = NameExtra;
/*Bundle extras = getIntent().getExtras();
if (extras !=null) {
NameExtra = extras.getString("Name");
if (NameExtra != null) {
TextView setName = (TextView) findViewById(R.id.EditName);
setName.setText("Player:" + NameExtra + "Have Fun");
name = NameExtra;
}
}
*/
/*
*/
Attempts = Attempts + 3;
//EditName = (EditText) findViewById(R.id.EdtName);
EditNum1 = (EditText) findViewById(R.id.EdtNum1);
Txtname = (TextView) findViewById(R.id.UserDisp);
radioGroup = (RadioGroup) findViewById(R.id.myRadioGroup);
radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
// find which radio button is selected
if (checkedId == R.id.Easy) {
Toast.makeText(getApplicationContext(), "Choice: 1-5",
Toast.LENGTH_SHORT).show();
} else if (checkedId == R.id.Medium) {
Toast.makeText(getApplicationContext(), "Choice: 1-10",
Toast.LENGTH_SHORT).show();
} else if (checkedId == R.id.Hard) {
Toast.makeText(getApplicationContext(), "Choice: 1-20",
Toast.LENGTH_SHORT).show();
}
}
});
easy = (RadioButton) findViewById(R.id.Easy);
medium = (RadioButton) findViewById(R.id.Medium);
hard = (RadioButton) findViewById(R.id.Hard);
}
public void Start(View StartDisp) {
int selectedId = radioGroup.getCheckedRadioButtonId();
//Txtname = (TextView) findViewById(R.id.UserDisp);
//Txtname.setText(name);
// find which radio Button is checked by id
if (selectedId == easy.getId()) {
Toast.makeText(getApplicationContext(), "You Chose 'Easy' '1-5'",
Toast.LENGTH_LONG).show();
getWindow().getDecorView().setBackgroundColor(
Color.parseColor("#abf234"));
max = 5;
} else if (selectedId == medium.getId()) {
Toast.makeText(getApplicationContext(),
"You Chose 'Medium' '1-10'", Toast.LENGTH_LONG).show();
getWindow().getDecorView().setBackgroundColor(
Color.parseColor("#E8A317"));
max = 10;
} else {
Toast.makeText(getApplicationContext(), "You Chose 'Hard' '1-20'",
Toast.LENGTH_LONG).show();
getWindow().getDecorView().setBackgroundColor(
Color.parseColor("#FF0000"));
max = 20;
}
random = RandomNumber(max);
//Txtname.setText(name + random );
Txtname = new TextView(this);
Txtnumber = new TextView(this);
TextView DispInform = new TextView(this);
EdtName = (EditText) findViewById(R.id.EdtName);
EditNum1 = (EditText) findViewById(R.id.EdtNum1);
Txtname = (TextView) findViewById(R.id.UserDisp);
Txtname = (TextView) findViewById(R.id.EditName);
Txtname.setText(name);
Txtnumber =(TextView) findViewById(R.id.EdtNum1);
num1 = Integer.parseInt(Txtnumber.getText().toString());
Strngnum1 = String.valueOf(num1);
StringBuilder StrngBuild = new StringBuilder();
StrngBuild.append(name);
StrngBuild.append(" You have Chosen the number");
StrngBuild.append(Strngnum1);
line 181 StrngBuild.append(random);
DispInform = (TextView) findViewById(R.id.DispAll);
DispInform.setText(StrngBuild);
}
public void Guess(View BtnGuess) {
TextView tvResult = (TextView) findViewById(R.id.tvResult);
if (Attempts > 0) {
EditGuess = (EditText) findViewById(R.id.EdtGuess);
guess = Integer.parseInt(EditGuess.getText().toString());
if (guess == random) {
result = "Correct";
tvResult.setText(result);
getWindow().getDecorView().setBackgroundColor(
Color.parseColor("#FFFFFF"));
}
else if ((guess + 3 == random) || (guess - 3 == random)) {
Attempts = Attempts - 1;
result = "Almost There";
tvResult.setText(result);
}
else if (guess - 6 == random) {
Attempts = Attempts - 1;
result = "Sky High that one";
tvResult.setText(result);
}
else if (guess + 6 == random) {
Attempts = Attempts - 1;
result = "Low blow guess that one";
tvResult.setText(result);
}
else
{
Attempts = Attempts - 1;
}
} else if (Attempts == 0) {
Toast.makeText(getApplicationContext(), "Out Of Attempts",
Toast.LENGTH_LONG).show();
getWindow().getDecorView().setBackgroundColor(
Color.parseColor("#43C6DB"));
}
}
public int RandomNumber(int Max) {
int random = 1 + (int) (Math.random() * ((Max - 1) - 1));
return random;
}
/*
* public void generateRandom() { random =
* Min+(int)(Math.random()*((Max-Min) + 1));
*
* if(random > Max || random < Min) { generateRandom(); }
*
* }
*/
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.gamemain, 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);
}
}
game.xml：
<TextView
android:id="@+id/Welcome"
android:layout_column="0"
android:layout_columnSpan="2"
android:layout_gravity="left"
android:layout_row="1"
android:text="Welcome:"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/EntrNum"
android:layout_width="167dp"
android:layout_column="0"
android:layout_columnSpan="3"
android:layout_gravity="left"
android:layout_row="3"
android:layout_rowSpan="2"
android:text="Please enter a number between 1 - 20"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/EdtName"
android:layout_column="0"
android:layout_columnSpan="3"
android:layout_gravity="left|bottom"
android:layout_row="6"
android:ems="10"
android:hint="Name"
android:text="" >
</TextView>
<EditText
android:id="@+id/EdtNum1"
android:layout_column="0"
android:layout_columnSpan="3"
android:layout_gravity="left"
android:layout_row="8"
android:ems="10"
android:hint="Number"
android:inputType="number" >
<requestFocus />
</EditText>
<RadioGroup
android:id="@+id/myRadioGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text"
android:checkedButton="@+id/sound" >
<RadioButton
android:id="@+id/Easy"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1-5" />
<RadioButton
android:id="@+id/Medium"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1-10" />
<RadioButton
android:id="@+id/Hard"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1-20" />
</RadioGroup>
<Space
android:layout_width="32dp"
android:layout_height="1dp"
android:layout_column="0"
android:layout_row="0" />
<Space
android:layout_width="1dp"
android:layout_height="32dp"
android:layout_column="0"
android:layout_row="0" />
<EditText
android:id="@+id/EdtGuess"
android:layout_width="157dp"
android:layout_column="1"
android:layout_gravity="left"
android:layout_row="15"
android:ems="10"
android:hint="Take A Guess"
android:inputType="number" />
<Button
android:id="@+id/StartDisp"
android:layout_width="164dp"
android:layout_height="83dp"
android:layout_column="2"
android:layout_columnSpan="2"
android:layout_gravity="left"
android:layout_row="14"
android:onClick="Start"
android:text="Start Game" />
<Button
android:id="@+id/BtnGuess"
android:layout_width="131dp"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_gravity="right|top"
android:layout_row="17"
android:onClick="Guess"
android:text="Guess" />
<Space
android:layout_width="226dp"
android:layout_height="1dp"
android:layout_column="6"
android:layout_row="0" />
<Space
android:layout_width="1dp"
android:layout_height="16dp"
android:layout_column="0"
android:layout_row="2" />
<Space
android:layout_width="1dp"
android:layout_height="16dp"
android:layout_column="0"
android:layout_row="7" />
<Space
android:layout_width="1dp"
android:layout_height="16dp"
android:layout_column="0"
android:layout_row="9" />
<Space
android:layout_width="1dp"
android:layout_height="2dp"
android:layout_column="0"
android:layout_row="10" />
<Space
android:layout_width="1dp"
android:layout_height="2dp"
android:layout_column="0"
android:layout_row="11" />
<Space
android:layout_width="1dp"
android:layout_height="4dp"
android:layout_column="0"
android:layout_row="12" />
<Space
android:layout_width="1dp"
android:layout_height="2dp"
android:layout_column="0"
android:layout_row="13" />
<Space
android:layout_width="1dp"
android:layout_height="78dp"
android:layout_column="0"
android:layout_row="15" />
<Space
android:layout_width="1dp"
android:layout_height="219dp"
android:layout_column="0"
android:layout_row="17" />
<Space
android:layout_width="1dp"
android:layout_height="53dp"
android:layout_column="0"
android:layout_row="14" />
<Space
android:layout_width="111dp"
android:layout_height="1dp"
android:layout_column="1"
android:layout_row="0" />
<Space
android:layout_width="77dp"
android:layout_height="1dp"
android:layout_column="2"
android:layout_row="0" />
<Space
android:layout_width="100dp"
android:layout_height="110dp"
android:layout_column="2"
android:layout_row="4" />
<Space
android:layout_width="100dp"
android:layout_height="110dp"
android:layout_column="2"
android:layout_row="4" />
<Space
android:layout_width="100dp"
android:layout_height="128dp"
android:layout_column="2"
android:layout_row="4" />
<Space
android:layout_width="100dp"
android:layout_height="162dp"
android:layout_column="2"
android:layout_row="4" />
<Space
android:layout_width="100dp"
android:layout_height="196dp"
android:layout_row="4" />
<TextView
android:id="@+id/tvResult"
android:layout_column="1"
android:layout_gravity="left|top"
android:layout_row="16"
android:text="result" />
<TextView
android:id="@+id/DispAll"
android:layout_height="wrap_content"
android:layout_column="6"
android:layout_gravity="right|top"
android:layout_row="5"
android:text=""
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="@+id/BtnReturn"
android:layout_column="1"
android:layout_gravity="left|center_vertical"
android:layout_row="17"
android:text="Return To Home Screen" />
<TextView
android:id="@+id/UserDisp"
android:layout_column="2"
android:layout_gravity="right|center_vertical"
android:layout_row="4"
android:textAppearance="?android:attr/textAppearanceLarge" />
</GridLayout>
如果你可以帮我解决这个问题，那将是非常有帮助和非常感谢另外一个问题是每当我在GuessingGame上并尝试启动我的应用程序崩溃时，这就是它的LogCat错误窗口：
03-15 14:48:56.350: E/AndroidRuntime(1397): FATAL EXCEPTION: main
03-15 14:48:56.350: E/AndroidRuntime(1397): Process: com.Lewis.c3383583task3, PID: 1397
03-15 14:48:56.350: E/AndroidRuntime(1397): java.lang.IllegalStateException: Could not execute method of the activity
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.view.View$1.onClick(View.java:3823)
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.view.View.performClick(View.java:4438)
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.view.View$PerformClick.run(View.java:18422)
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.os.Handler.handleCallback(Handler.java:733)
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.os.Handler.dispatchMessage(Handler.java:95)
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.os.Looper.loop(Looper.java:136)
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-15 14:48:56.350: E/AndroidRuntime(1397): at java.lang.reflect.Method.invokeNative(Native Method)
03-15 14:48:56.350: E/AndroidRuntime(1397): at java.lang.reflect.Method.invoke(Method.java:515)
03-15 14:48:56.350: E/AndroidRuntime(1397): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-15 14:48:56.350: E/AndroidRuntime(1397): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-15 14:48:56.350: E/AndroidRuntime(1397): at dalvik.system.NativeStart.main(Native Method)
03-15 14:48:56.350: E/AndroidRuntime(1397): Caused by: java.lang.reflect.InvocationTargetException
03-15 14:48:56.350: E/AndroidRuntime(1397): at java.lang.reflect.Method.invokeNative(Native Method)
03-15 14:48:56.350: E/AndroidRuntime(1397): at java.lang.reflect.Method.invoke(Method.java:515)
03-15 14:48:56.350: E/AndroidRuntime(1397): at android.view.View$1.onClick(View.java:3818)
03-15 14:48:56.350: E/AndroidRuntime(1397): ... 11 more
03-15 14:48:56.350: E/AndroidRuntime(1397): Caused by: java.lang.NullPointerException
03-15 14:48:56.350: E/AndroidRuntime(1397): at com.Lewis.c3383583task3.GuessGame.Start(GuessGame.java:181)
03-15 14:48:56.350: E/AndroidRuntime(1397): ... 14 more
如果你发现任何你认为可能成为问题的事情，请告诉我谢谢。