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Java 如何在具有意图的活动之间传递布尔值

java android

Java 如何在具有意图的活动之间传递布尔值,java,android,android-intent,boolean,Java,Android,Android Intent,Boolean,这是开始的活动，我试图将4个布尔变量发送到下一个活动，每个布尔变量对应一个基本数学运算，以查看用户检查了哪一个。但是他们在下一个活动中总是错误的，我不知道为什么。下面是下一个活动： public class StartActivity extends AppCompatActivity { private boolean addition=true; private boolean subtraction=false; private boolean multiplic

这是开始的活动，我试图将4个布尔变量发送到下一个活动，每个布尔变量对应一个基本数学运算，以查看用户检查了哪一个。但是他们在下一个活动中总是错误的，我不知道为什么。下面是下一个活动：

public class StartActivity extends AppCompatActivity {

    private boolean addition=true;
    private boolean subtraction=false;
    private boolean multiplication=false;
    private boolean division=false;

    public static final String ADDITION = "";
    public static final String SUBTRACTION = "";
    public static final String MULTIPLICATION= "";
    public static final String DIVISION = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start);

        final Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        setSupportActionBar(myToolbar);

        CheckBox additionCheckBox = (CheckBox)findViewById(R.id.additionCheckBox);
        CheckBox multiplicationCheckBox = (CheckBox)findViewById(R.id.multiplicationCheckBox);
        CheckBox divisionCheckBox = (CheckBox)findViewById(R.id.divisionCheckBox);
        CheckBox subtractionCheckBox = (CheckBox)findViewById(R.id.subtractionCheckBox);

        Button playButton = (Button)findViewById(R.id.playButton);

        additionCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(buttonView.isChecked()){
                    addition = true;
                }else{
                    addition = false;
                }
            }
        });

        multiplicationCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(buttonView.isChecked()){
                   multiplication = true;
                }else{
                    multiplication= false;
                }
            }
        });

        subtractionCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(buttonView.isChecked()){
                    subtraction = true;
                }else{
                    subtraction = false;
                }
            }
        });

        divisionCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(buttonView.isChecked()){
                    division = true;
                }else{
                    division = false;
                }
            }
        });

        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!addition && !subtraction && !multiplication && !division){
                    final Dialog dialog = new Dialog(StartActivity.this);
                    dialog.setContentView(R.layout.custom_dialog);
                    dialog.setTitle("My custom dialog");

                    //set the custom dialog components - text, image and button
                    TextView text = (TextView) dialog.findViewById(R.id.textView);
                    text.setText("Android custom dialog example!");


                    Button button = (Button) dialog.findViewById(R.id.button);
                    button.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                        dialog.dismiss();
                        }
                    });

                    dialog.show();
                } else{
                    Intent i = new Intent(StartActivity.this, Main2Activity.class);
                    i.putExtra(ADDITION,addition);
                    i.putExtra(SUBTRACTION,subtraction);
                    i.putExtra(MULTIPLICATION,multiplication);
                    i.putExtra(DIVISION,division);
                    startActivity(i);
                }
            }
        });
}
我正在设置文本框中的文本，以查看值是否正确传递，但始终为false。抱歉，我对android很陌生，实际上这是android的第四个迷你项目及其学校作业。

尝试使用此代码发送和获取值

传递到第一个活动：

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        final Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        setSupportActionBar(myToolbar);

        Intent i = getIntent();
        Bundle b = i.getExtras();
        boolean addition = b.getBoolean("ADDITION");
        boolean subtraction = Boolean.getBoolean("SUBTRACTION");
        boolean multiplication = b.getBoolean("MULTIPLICATION");
        boolean division = b.getBoolean("DIVISION");

        int operatorCounter =0;

        TextView additionTextView = (TextView) findViewById(R.id.additionTextView);
        TextView subtractionTextView = (TextView) findViewById(R.id.subtractionTextView);
        TextView multiplicationTextView = (TextView) findViewById(R.id.multiplicationTextView);
        TextView divisionTextView = (TextView) findViewById(R.id.divisionTextView);

        if (addition) {
            additionTextView.setText("addition:checked");
        }else{
            additionTextView.setText("addition:not checked");
        }

        if (subtraction) {
            subtractionTextView.setText("subtraction:checked");
        }else{
            subtractionTextView.setText("subtraction:not checked");
        }

        if (multiplication) {
            multiplicationTextView.setText("multiplication:checked");
        }else{
            multiplicationTextView.setText("multiplication:not checked");
        }

        if (division) {
           divisionTextView.setText("division:checked");
        }else{
          divisionTextView.setText("division:not checked");
        }   
    }
}

Intent i = new Intent(getBaseContext(), NameOfActivity.class);
i.putExtra("my_boolean_key", myBooleanVariable);
startActivity(i);
在第二个活动中检索：

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        final Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
        setSupportActionBar(myToolbar);

        Intent i = getIntent();
        Bundle b = i.getExtras();
        boolean addition = b.getBoolean("ADDITION");
        boolean subtraction = Boolean.getBoolean("SUBTRACTION");
        boolean multiplication = b.getBoolean("MULTIPLICATION");
        boolean division = b.getBoolean("DIVISION");

        int operatorCounter =0;

        TextView additionTextView = (TextView) findViewById(R.id.additionTextView);
        TextView subtractionTextView = (TextView) findViewById(R.id.subtractionTextView);
        TextView multiplicationTextView = (TextView) findViewById(R.id.multiplicationTextView);
        TextView divisionTextView = (TextView) findViewById(R.id.divisionTextView);

        if (addition) {
            additionTextView.setText("addition:checked");
        }else{
            additionTextView.setText("addition:not checked");
        }

        if (subtraction) {
            subtractionTextView.setText("subtraction:checked");
        }else{
            subtractionTextView.setText("subtraction:not checked");
        }

        if (multiplication) {
            multiplicationTextView.setText("multiplication:checked");
        }else{
            multiplicationTextView.setText("multiplication:not checked");
        }

        if (division) {
           divisionTextView.setText("division:checked");
        }else{
          divisionTextView.setText("division:not checked");
        }   
    }
}

Intent i = new Intent(getBaseContext(), NameOfActivity.class);
i.putExtra("my_boolean_key", myBooleanVariable);
startActivity(i);
希望这能帮助您解决问题我看到的问题是id：

Bundle bundle = getIntent().getExtras();
boolean myBooleanVariable = bundle.getBoolean("my_boolean_key");
这应该是一些不同的东西，比如：

public static final String ADDITION = "";
public static final String SUBTRACTION = "";
public static final String MULTIPLICATION= "";
public static final String DIVISION = "";
并使用相同的值检索其他活动中的值，因为您没有在全局变量中设置值，所以需要像这样设置第一个全局变量值

public static final String ADDITION = "ADDITION";
public static final String SUBTRACTION = "SUBTRACTION";
public static final String MULTIPLICATION= "MULTIPLICATION";
public static final String DIVISION = "DIVISION";

Intent i = new Intent(StartActivity.this, Main2Activity.class);
                i.putExtra(ADDITION,addition);
                i.putExtra(SUBTRACTION,subtraction);
                i.putExtra(MULTIPLICATION,multiplication);
                i.putExtra(DIVISION,division);
                startActivity(i);
那就定下来

public static final String ADDITION = "ADDITION";
public static final String SUBTRACTION = "SUBTRACTION";
public static final String MULTIPLICATION= "MULTIPLICATION";
public static final String DIVISION = "DIVISION";
而不是像这样从另一个活动中获取值

public static final String ADDITION = "ADDITION";
public static final String SUBTRACTION = "SUBTRACTION";
public static final String MULTIPLICATION= "MULTIPLICATION";
public static final String DIVISION = "DIVISION";

Intent i = new Intent(StartActivity.this, Main2Activity.class);
                i.putExtra(ADDITION,addition);
                i.putExtra(SUBTRACTION,subtraction);
                i.putExtra(MULTIPLICATION,multiplication);
                i.putExtra(DIVISION,division);
                startActivity(i);
确保使用相同的密钥来放置和获取数据

也更新

 boolean addition = getIntent().getExtras().getBoolean("ADDITION");
 boolean sub = getIntent().getExtras().getBoolean("SUBTRACTION");
 boolean mult = getIntent().getExtras().getBoolean("MULTIPLICATION");
 boolean division = getIntent().getExtras().getBoolean("DIVISION");
到

从意图检索布尔值：

Intent intent = new Intent(this, NextActivity.class);
intent.putExtra("BoolName", true);
startActivity(intent );
我将用这篇文章来说明为什么一个mcve是有用的，因为这是一个完美的例子，我将使用他的代码，清理无用的部分，我们会很快发现问题，我不值得或要求向上投票，但也不要向下投票，如果你反对这个答案，请发表评论，如果需要，我会删除它

所以，让我们来清理代码，我只对这里的
意图
创建感兴趣。因此，让我们清理其余部分并保留使用的变量/常量。简单地说，我们只需要一个布尔值，让我们保留第一个布尔值


 Boolean yourBool = getIntent().getExtras().getBoolean("BoolName");


嗯，这样更好。在一个屏幕上显示，我们可以直接看到问题

恢复过程中的情况也一样：


public class StartActivity extends AppCompatActivity {

private boolean addition=true;

public static final String ADDITION = "";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_start);

    Button playButton = (Button)findViewById(R.id.playButton);

    playButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(StartActivity.this, Main2Activity.class);
            i.putExtra(ADDITION,addition);
            startActivity(i);
        }
    });


嗯，可以在这里使用StartActivity.ADDITION…
我希望代码能帮助您
Intent Intent=新的Intent（this，nextractivity.class）；
intent.putExtra（“yourBoolName”，true）

}
Intent intt=新的Intent（this，YourAcivity.class）


}
问题中发布的代码不就是这么做的吗？我不明白你说了什么请解释…@RC要诚实，你需要先找到行；）但正如佩特罗莫所说，问题在于keys@AxelH是的，关键问题是一个很好的问题，我同意，如果有一些解释（我认为OP知道如何做，他/她的代码只是与关键有一些问题），这个答案会很好@RC，公平地说，这个问题本来可以通过创建，这是显而易见的。请参阅：欢迎，这是大量的代码行，只是为了创建传递布尔值的意图。你应该看看如何写一篇文章。但我认为你会找到答案，所以通过搜索一个位，你应该加上，因为他创建了常数，OP也应该使用它们来获取意图中的值。与其放另一个答案，不如更新旧答案

intt.putExtra("BooleanKey",true);
startActivity(intt);





 protected void onCreate(Bundle savedInstanceState) {
Boolean yourBool = getIntent().getExtras().getBoolean("yourBoolName");