Java 无法在文本视图数组中应用字符串值
在if(saveInstanceState!=null)中,我试图保存whowen()方法在文本视图中对文本所做的更改,以便在用户旋转手机时将其保存并恢复到旋转前的状态,但它显示了一个错误,即TextView中的getText()无法应用于(java.lang.string),我尝试添加.toString()但它不起作用Java 无法在文本视图数组中应用字符串值,java,android,variables,Java,Android,Variables,在if(saveInstanceState!=null)中,我试图保存whowen()方法在文本视图中对文本所做的更改,以便在用户旋转手机时将其保存并恢复到旋转前的状态,但它显示了一个错误,即TextView中的getText()无法应用于(java.lang.string),我尝试添加.toString()但它不起作用 public class Multiplayer extends AppCompatActivity { private TextView mTicTacTextVie
public class Multiplayer extends AppCompatActivity {
private TextView mTicTacTextViews [] = new TextView[9];
private Button mButtonX;
private Button mButtonO;
private Button mResult;
private int mcheckAllButtonsClicked =0;
private String TEXT_VIEW_VALUES_KEY = "VALUES OF TEXT VIEW'S";
private String mTextviewValues [] = new String[9];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(savedInstanceState != null)
{
String values[]=savedInstanceState.getStringArray(TEXT_VIEW_VALUES_KEY);
for (int i=0;i<values.length;i++ ) {
mTextviewValues[i]=values[i];
mTicTacTextViews[i].getText(mTextviewValues[i]);
}
}
setContentView(R.layout.activity_tic_tac);
mTicTacTextViews[0] = (TextView) findViewById(R.id.tic_tac_one);
mTicTacTextViews[0].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[0]);
ifPressed_OButton(mTicTacTextViews[0]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[1] = (TextView) findViewById(R.id.tic_tac_two);
mTicTacTextViews[1].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[1]);
ifPressed_OButton(mTicTacTextViews[1]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[2] = (TextView) findViewById(R.id.tic_tac_three);
mTicTacTextViews[2].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[2]);
ifPressed_OButton(mTicTacTextViews[2]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[3] = (TextView) findViewById(R.id.tic_tac_four);
mTicTacTextViews[3].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[3]);
ifPressed_OButton(mTicTacTextViews[3]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[4] = (TextView) findViewById(R.id.tic_tac_five);
mTicTacTextViews[4].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[4]);
ifPressed_OButton(mTicTacTextViews[4]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[5] = (TextView) findViewById(R.id.tic_tac_six);
mTicTacTextViews[5].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[5]);
ifPressed_OButton(mTicTacTextViews[5]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[6] = (TextView) findViewById(R.id.tic_tac_seven);
mTicTacTextViews[6].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[6]);
ifPressed_OButton(mTicTacTextViews[6]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[7] = (TextView) findViewById(R.id.tic_tac_eight);
mTicTacTextViews[7].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[7]);
ifPressed_OButton(mTicTacTextViews[7]);
mcheckAllButtonsClicked+=1;
}
});
mTicTacTextViews[8] = (TextView) findViewById(R.id.tic_tac_nine);
mTicTacTextViews[8].setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ifPressed_XButton(mTicTacTextViews[8]);
ifPressed_OButton(mTicTacTextViews[8]);
mcheckAllButtonsClicked+=1;
}
});
mButtonX = (Button) findViewById(R.id.x_button);
mButtonX.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mUserPressed_XButton =true;
}
});
mButtonO = (Button) findViewById(R.id.o_button);
mButtonO.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mUserPressed_OButton =true;
}
});
mTextviewValues [0]=mTicTacTextViews[0].getText().toString();
mTextviewValues [1]=mTicTacTextViews[1].getText().toString();
mTextviewValues [2]=mTicTacTextViews[2].getText().toString();
mTextviewValues [3]=mTicTacTextViews[3].getText().toString();
mTextviewValues [4]=mTicTacTextViews[4].getText().toString();
mTextviewValues [5]=mTicTacTextViews[5].getText().toString();
mTextviewValues [6]=mTicTacTextViews[6].getText().toString();
mTextviewValues [7]=mTicTacTextViews[7].getText().toString();
mTextviewValues [8]=mTicTacTextViews[8].getText().toString();
mResult = (Button) findViewById(R.id.result_button);
mResult.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
whoWon();
}
});
}
private void whoWon ()
{
mTextviewValues [0]=mTicTacTextViews[0].getText().toString();
mTextviewValues [1]=mTicTacTextViews[1].getText().toString();
mTextviewValues [2]=mTicTacTextViews[2].getText().toString();
mTextviewValues [3]=mTicTacTextViews[3].getText().toString();
mTextviewValues [4]=mTicTacTextViews[4].getText().toString();
mTextviewValues [5]=mTicTacTextViews[5].getText().toString();
mTextviewValues [6]=mTicTacTextViews[6].getText().toString();
mTextviewValues [7]=mTicTacTextViews[7].getText().toString();
mTextviewValues [8]=mTicTacTextViews[8].getText().toString();
if(mTextviewValues[0].equals(mTextviewValues[1]) & mTextviewValues[1].equals(mTextviewValues[2]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else if (mTextviewValues[1].equals(mTextviewValues[4]) & mTextviewValues[4].equals(mTextviewValues[8]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else if (mTextviewValues[0].equals(mTextviewValues[3]) & mTextviewValues[3].equals(mTextviewValues[6]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else if (mTextviewValues[1].equals(mTextviewValues[4]) & mTextviewValues[4].equals(mTextviewValues[7]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else if (mTextviewValues[2].equals(mTextviewValues[5]) & mTextviewValues[5].equals(mTextviewValues[8]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else if (mTextviewValues[2].equals(mTextviewValues[4]) & mTextviewValues[4].equals(mTextviewValues[6]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else if (mTextviewValues[2].equals(mTextviewValues[4]) & mTextviewValues[4].equals(mTextviewValues[6]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else if (mTextviewValues[6].equals(mTextviewValues[7]) & mTextviewValues[7].equals(mTextviewValues[8]))
{
Toast.makeText(this,"Someone won",Toast.LENGTH_SHORT).show();
}
else Log.i("error" , "whowon didn't work");
}
@Override
protected void onSaveInstanceState(Bundle bundle)
{
super.onSaveInstanceState(bundle);
bundle.putStringArray(TEXT_VIEW_VALUES_KEY,mTextviewValues);
}
}
公共类多人游戏扩展AppCompative活动{
私有文本视图mTicTacTextViews[]=新文本视图[9];
私人按钮mButtonX;
私人按钮;
专用按钮mResult;
private int mcheckalbuttonsclicked=0;
私有字符串TEXT\u VIEW\u VALUES\u KEY=“文本视图的值”;
私有字符串mTextviewValues[]=新字符串[9];
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
如果(savedInstanceState!=null)
{
字符串值[]=savedInstanceState.getStringArray(文本\视图\值\键);
for(int i=0;igetText()
不接受参数。mTicTacTextViews[i]。getText()
返回视图中的文本。是否尝试在视图中设置文本?如果是,则需要setText(CharSequence)
,而不是CharSequence getText()
你能去掉多余的代码吗?一个问题建议在空对象引用上使用.app崩溃,错误为“尝试调用虚拟方法”void android.widget.TextView.setText(java.lang.CharSequence)”这意味着您的TextView变量为null。这是有意义的,因为您直到(非常、非常长)方法的下一步才填充它。不,我在onCreate()中给mTextViewValues[]它文本值的不仅仅是whowen()Yes,问题是mTicTacTextViews[I]
为null。如果(savedInstanceState!=null),请移动
在setOnClickListener附近,你应该会过得更好。此外,如果你将onCreate
分解为多个方法,你会发现这会容易得多。比如createTextView(id)
,populateTextView(id)
、createXButton
、createOButton
和setupListener
。这样,在创建视图之前,您会发现更容易找到填充视图的位置。