如何在具有意图的活动之间传递布尔值

时间：2016-12-28 11:55:58

标签： java android android-intent boolean 

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);
                }
            }
        });
}

这是开始活动，我正在尝试向每个基本数学运算发送4个布尔变量的下一个活动，以查看用户检查了哪一个。但是他们在下一次活动中总是假的，我不知道为什么。这是下一个活动：

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");
        }   
    }
}

我在文本框中设置文本以查看值是否正确传递但始终为false。对不起代码不好我在android中很新，实际上是android及其学校作业中的第四个迷你项目。

8 个答案:

答案 0 :(得分：4)

我看到的问题是id：

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

这应该是不同的东西，如：

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

并使用相同的值来检索其他活动中的值

答案 1 :(得分：1)

尝试使用此代码发送和获取值;

传递给第一个活动：

Intent i = new Intent(getBaseContext(), NameOfActivity.class);
i.putExtra("my_boolean_key", myBooleanVariable);
startActivity(i);

检索第二个活动：

Bundle bundle = getIntent().getExtras();
boolean myBooleanVariable = bundle.getBoolean("my_boolean_key");

希望这可以帮助你

答案 2 :(得分：1)

因为你没有在全局变量中设置值，所以你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";

然后设置

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);

比来自其他活动的aceess值

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

答案 3 :(得分：1)

确保使用相同的键来放置和获取数据。

同时更新

boolean subtraction = Boolean.getBoolean("SUBTRACTION");

到

boolean subtraction = b.getBoolean("SUBTRACTION");

答案 4 :(得分：1)

List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);

从intent中检索布尔值：

Intent intent = new Intent(this, NextActivity.class);
intent.putExtra("BoolName", true);
startActivity(intent );

答案 5 :(得分：1)

我将使用这篇文章来说明为什么 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，如果你反对这个答案，我也不应该或者要求upvote但不要投票，评论我会在需要时将其删除。

所以，让我们清理代码，我只对这里的Intent创建感兴趣。因此，请清理其余部分并保留使用的变量/常量。为了最小化，我们只需要一个布尔值，让第一个putBoolean。

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，这样更好。适合一个屏幕，我们直接看到问题。

恢复相同：

public class Main2Activity extends AppCompatActivity {

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

        Intent i = getIntent();
        Bundle b = i.getExtras();
        boolean addition = b.getBoolean("ADDITION");
    }
}

嗯，可以在这里使用StartActivity.ADDITION ......

答案 6 :(得分：1)

我希望代码可以帮到你 Intent intent = new Intent（this，NextActivity.class）; intent.putExtra（＆＃34; yourBoolName＆＃34;，true）; 

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

}

答案 7 :(得分：1)

Intent intt = new Intent（this，YourAcivity.class）; 

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





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

}

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