所以我刚刚开始编程，但我并没有真正理解 OnClickListener 方法。我已经在谷歌上搜索了我遇到的错误:“类型 new View.OnClickListener(){} 必须实现继承的抽象方法 View.OnClickListener.OnClick(View)”，我尝试更改代码中的一些内容，但它仍然如此'不工作。谁能确切地告诉我我的代码需要更改什么？提前致谢。
MainMenuScreen.java:
package com.wouter.testjk;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
public class MainMenuScreen extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main_menu);
//error on the line below
((Button) findViewById(R.id.one_player)).setOnClickListener(new OnClickListener() { //the error is here
public void onClick(View V) {
Log.d("DEBUG", "One Player Button Pressed!");
Intent intent = new Intent(MainMenuScreen.this, TicTacToeGame.class);
intent.putExtra("gameType", true);
startActivityForResult(intent, 0);
}
});
((Button) findViewById(R.id.two_player)).setOnClickListener(new OnClickListener() {
public void onClick(View V) {
Log.d("DEBUG", "Two Player Button Pressed!");
Intent intent = new Intent(MainMenuScreen.this, TicTacToeGame.class);
intent.putExtra("gameType", false);
startActivityForResult(intent, 0);
}
});
((Button) findViewById(R.id.exit_game)).setOnClickListener(new OnClickListener() {
public void onClick(View V) {
Log.d("DEBUG", "Exit Game Button Pressed!");
MainMenuScreen.this.finish();
}
});
}
}
MainActivity.java:
package com.wouter.testjk;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.TextView;
import com.wouter.testjk.R;
public class MainActivity extends Activity implements OnClickListener{
private TicTacToeGame mGame;
private Button mBoardButtons[];
private TextView mInfoTextView;
private TextView mPlayeroneCount;
private TextView mTieCount;
private TextView mPlayertwoCount;
private TextView mPlayeroneText;
private TextView mPlayertwoText;
private int mPlayeroneCounter = 0;
private int mTieCounter = 0;
private int mPlayertwoCounter = 0;
private boolean mPlayeroneFirst = true;
private boolean mIsSinglePlayer = false;
private boolean mIsPlayerOneTurn = true;
private boolean mGameOver = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
boolean mGameType = getIntent().getExtras().getBoolean("gametype");
mBoardButtons = new Button[mGame.getBOARD_SIZE()];
mBoardButtons[0] = (Button) findViewById(R.id.one);
mBoardButtons[1] = (Button) findViewById(R.id.two);
mBoardButtons[2] = (Button) findViewById(R.id.three);
mBoardButtons[3] = (Button) findViewById(R.id.four);
mBoardButtons[4] = (Button) findViewById(R.id.five);
mBoardButtons[5] = (Button) findViewById(R.id.six);
mBoardButtons[6] = (Button) findViewById(R.id.seven);
mBoardButtons[7] = (Button) findViewById(R.id.eight);
mBoardButtons[8] = (Button) findViewById(R.id.nine);
Button mTen = (Button) findViewById(R.id.ten);
mTen.setOnClickListener(this);
Button mEleven = (Button) findViewById(R.id.eleven);
mEleven.setOnClickListener(this);
mInfoTextView = (TextView) findViewById(R.id.information);
mPlayeroneCount = (TextView) findViewById(R.id.humancount);
mTieCount = (TextView) findViewById(R.id.tiesCount);
mPlayertwoCount = (TextView) findViewById(R.id.androidCount);
mPlayeroneText = (TextView) findViewById(R.id.human);
mPlayertwoText = (TextView) findViewById(R.id.android);
mPlayeroneCount.setText(Integer.toString(mPlayeroneCounter));
mTieCount.setText(Integer.toString(mTieCounter));
mPlayeroneCount.setText(Integer.toString(mPlayertwoCounter));
mGame = new TicTacToeGame();
startNewGame(mGameType);
}
private void startNewGame(boolean isSingle)
{
//some code here
}
private class ButtonClickListener implements View.OnClickListener
{
int location;
public ButtonClickListener(int location)
{
this.location = location;
}
@Override
public void onClick(View view) {
if (!mGameOver)
{
if(mBoardButtons[location].isEnabled())
{
if(mIsSinglePlayer)
{
setMove(mGame.PLAYER_ONE, location);
int winner = mGame.checkForWinner();
if (winner == 0)
{
mInfoTextView.setText(R.string.turn_computer);
int move = mGame.getComputerMove();
setMove(mGame.PLAYER_TWO, move);
winner = mGame.checkForWinner();
}
if (winner == 0)
mInfoTextView.setText(R.string.turn_human);
else if (winner == 1)
{
mInfoTextView.setText(R.string.result_tie);
mTieCounter++;
mTieCount.setText(Integer.toString(mTieCounter));
mGameOver = true;
}
else if (winner ==2)
{
mInfoTextView.setText(R.string.result_human_wins);
mPlayeroneCounter++;
mPlayeroneCount.setText(Integer.toString(mPlayeroneCounter));
mGameOver = true;
}
else if (winner ==3)
{
mInfoTextView.setText(R.string.result_android_wins);
mPlayertwoCounter++;
mPlayertwoCount.setText(Integer.toString(mPlayertwoCounter));
mGameOver = true;
}
}
else
{
if(mIsPlayerOneTurn)
{
setMove(mGame.PLAYER_ONE, location);
}
else
{setMove(mGame.PLAYER_TWO, location);
}
int winner = mGame.checkForWinner();
if (winner == 0)
{
if(mIsPlayerOneTurn)
{
mInfoTextView.setText(R.string.turn_player_two);
mIsPlayerOneTurn = false;
}
else
{
mInfoTextView.setText(R.string.turn_player_one);
mIsPlayerOneTurn = true;
}
}
else if (winner == 1)
{
mInfoTextView.setText(R.string.result_tie);
mTieCounter++;
mTieCount.setText(Integer.toString(mTieCounter));
mGameOver = true;
}
else if (winner ==2)
{
mInfoTextView.setText(R.string.player_one_wins);
mPlayeroneCounter++;
mPlayeroneCount.setText(Integer.toString(mPlayeroneCounter));
mGameOver = true;
}
else if (winner ==3)
{
mInfoTextView.setText(R.string.player_two_wins);
mPlayertwoCounter++;
mPlayertwoCount.setText(Integer.toString(mPlayertwoCounter));
mGameOver = true;
}
}
}
}
}
}
private void setMove(char player, int location)
{
mGame.setMove(player,location);
mBoardButtons[location].setEnabled(false);
mBoardButtons[location].setText(String.valueOf(player));
if (player == mGame.PLAYER_ONE)
mBoardButtons[location].setTextColor(Color.GREEN);
else
{
mBoardButtons[location].setTextColor(Color.RED);
}
}
@Override
public void onClick(View view) {
switch (view.getId())
{
case R.id.ten:
startNewGame(mIsSinglePlayer);
return;
case R.id.eleven:
MainActivity.this.finish();
return;
}
}
}
最佳答案
听起来像是一个项目错误。首先遵循良好的代码指南。
当重写方法(例如 onClick)时，请在其前面添加
@Override注释。如果这样的方法不存在，这会让编译器大喊大叫。使用
View.OnClickListener指定您的界面属于哪个类。Button已经是一个View，无需将其强制转换来设置 OnClickListener。
它可能是这样的:
// No need to cast it to a button here, as it
findViewById(R.id.one_player).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d("DEBUG", "One Player Button Pressed!");
Intent intent = new Intent(MainMenuScreen.this, TicTacToeGame.class);
intent.putExtra("gameType", true);
startActivityForResult(intent, 0);
}
});
最后清理/重建您的项目，因为在使用您的代码时我不会出现此错误。
关于java - new View.OnClickListener 类型必须实现继承的抽象方法，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26947720/