Question

我的操作栏中有一个按钮，我希望当用户点击该按钮时，它会显示另一个活动，例如普通按钮的意图。这是我的主要活动：

    @Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.item, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item)
{
    super.onOptionsItemSelected(item);

    switch(item.getItemId()) {
            case R.id.exit:
    new AlertDialog.Builder(MainActivity.this)
        .setMessage("میخوای از برنامه بری بیرون؟")
        .setCancelable(true)
        .setPositiveButton("اره :(",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,
                                int id) {
                finish();


            }

        }).setNegativeButton("نه :)", null).show();

        case R.id.info:








}



    return true; }}

我想要那个案例的意图R.id.info：我试过这段代码：

case R.id.info:
    public void on click(View view) {
       Intent intent = new Intent();
       intent.setClass(MainActivity.this,Info.class);
       start activity(intent);
       }

但它不起作用并且显示一些错误

请某人帮助我:(

Answer 1

在manifest.xml中注册您的活动

类名应该在android：name

中

<activity
      android:name=".ToActivity"
      android:label="@string/app_name">          
 </activity>

Answer 2

将您的onOptionsItemSelected(MenuItem item)更改为：

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
        case  case R.id.exit:
            new AlertDialog.Builder(MainActivity.this)
                .setMessage("میخوای از برنامه بری بیرون؟")
                .setCancelable(true)
                .setPositiveButton("اره :(",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {
                            finish();
                        }
                    }).setNegativeButton("نه :)", null).show();
            break;

        case R.id.info:
            Intent intent = new Intent(MainActivity.this, Info.class);
            startActivity(intent);
            break;
    }
    return super.onOptionsItemSelected(item);
}

Answer 3

Use this, hope it works for you:

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu, menu);
    mainMenu = 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.info) {
                startActivity(new Intent(getApplicationContext(), Info.class));
                return true;
            }
return super.onOptionsItemSelected(item);
    }

菜单项按钮的意图

3 个答案: