Comment ajouter un bouton dynamiquement sous Android?

Comment ajouter un bouton dynamiquement sous Android?

Button myButton = new Button(this);
myButton.setText("Push Me");

LinearLayout ll = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
ll.addView(myButton, lp);

Jetez un œil à cet exemple

essaye ça:

for (int i = 1; i <= 20; i++) {
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);
    Button btn = new Button(this);
    btn.setId(i);
    final int id_ = btn.getId();
    btn.setText("button " + id_);
    btn.setBackgroundColor(Color.rgb(70, 80, 90));
    linear.addView(btn, params);
    btn1 = ((Button) findViewById(id_));
    btn1.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Toast.makeText(view.getContext(),
                    "Button clicked index = " + id_, Toast.LENGTH_SHORT)
                    .show();
        }
    });
}

Essaye ça:

LinearLayout ll = (LinearLayout)findViewById(R.id.layout);

Button btn = new Button(this);
btn.setText("Manual Add");
btn.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
ll.addView(btn);

essaye ça

private void createLayoutDynamically(int n) {

    for (int i = 0; i < n; i++) {
        Button myButton = new Button(this);
        myButton.setText("Button :"+i);
        myButton.setId(i);
        final int id_ = myButton.getId();

        LinearLayout layout = (LinearLayout) findViewById(R.id.myDynamicLayout);
        layout.addView(myButton);

        myButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Toast.makeText(DynamicLayout.this,
                        "Button clicked index = " + id_, Toast.LENGTH_SHORT)
                        .show();
            }
        });
    }

for (int k = 1; k < 100; k++) {
    TableRow row = new TableRow(this);

    innerloop:
    for (int l = 1; l < 4; l++) {
        btn = new Button(this);
        TableRow.LayoutParams tr = new TableRow.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        layout.setWeightSum(12.0f);
        tr.weight = 0;
        btn.setLayoutParams(tr); 
        btn.setTextColor(a);
        btn.setHeight(150);

        btn.setWidth(150);
        btn.setId(idb);
        btn.setText("Button " + idb);
        row.addView(btn);
    }
}

Essayez ce code

 Button btn=new Button(this);
btn.setId(btn);
btn.setBackgroundResource(R.drawable.image);
btn.setMinimumHeight(150);
btn.setMinimumWidth(150);
Relativelayout.addView(btn); 

Essayez ce code. Cela fonctionnera très bien.

public class DynamicViewsActivity extends Activity {

Button button;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //setContentView(R.layout.activity_dynamic_views);
    ScrollView scrl=new ScrollView(this);
    final LinearLayout ll=new LinearLayout(this);
    ll.setOrientation(LinearLayout.HORIZONTAL);
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    layoutParams.setMargins(100, 500, 100, 200);
    scrl.addView(ll);
    Button add_btn=new Button(this);
    add_btn.setText("Click Here");

    ll.addView(add_btn, layoutParams);


    final Context context = this;

    add_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            Intent intent = new Intent(context, App2Activity.class);
            startActivity(intent);
        }
    });
    this.setContentView(scrl);
}
}

Vérifiez ceci.

LinearLayout ll_Main  = new LinearLayout(getActivity());
LinearLayout ll_Row01 = new LinearLayout(getActivity());
LinearLayout ll_Row02 = new LinearLayout(getActivity());

ll_Main.setOrientation(LinearLayout.VERTICAL);
ll_Row01.setOrientation(LinearLayout.HORIZONTAL);
ll_Row02.setOrientation(LinearLayout.HORIZONTAL);

final Button button01    = new Button(getActivity());
final Button button02    = new Button(getActivity());   
final Button button03    = new Button(getActivity());
final Button button04    = new Button(getActivity());

ll_Row01.addView(button01);
ll_Row01.addView(button02);

ll_Row02.addView(button03);
ll_Row02.addView(button04);

ll_Main.addView(ll_Row01);
ll_Main.addView(ll_Row02);

button04.setVisibility(View.INVISIBLE);
button04.setVisibility(View.VISIBLE);

Essayez de suivre le code.

LinearLayout layout = (LinearLayout) findViewById(R.id.llayout); 
layout.setOrientation(LinearLayout.VERTICAL);

Button btn = new Button(this);
btn.setText("Button1");

layout.add(btn);

btn = new Button(this);
btn.setText(Button2);
layout.add(btn);

comme ça, vous ajoutez des boutons selon vos besoins.

public void add_btn() {

    lin_btn.setWeightSum(3f);
    for (int j = 0; j < 3; j++) {
        LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        params1.setMargins(10, 0, 0, 10);
        params1.weight = 1.0f;

        LinearLayout ll;
        ll = new LinearLayout(this);
        ll.setGravity(Gravity.CENTER_VERTICAL);
        ll.setOrientation(LinearLayout.HORIZONTAL);
        ll.setLayoutParams(params1);

        final Button btn;
        btn = new Button(DynamicActivity.this);

        btn.setText("A"+(j+1));
        btn.setTextSize(15);
        btn.setId(j);
        btn.setPadding(10, 8, 10, 10);

        ll.addView(btn);

        lin_btn.addView(ll);


        btn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                if(v.getId()==0)
                {
                    txt_text.setText("Hii");
                }else if(v.getId()==1)
                {
                    txt_text.setText("hello");
                }else if(v.getId()==2)
                {
                    txt_text.setText("how r u");
                }



            }
        });
    }

}

En fait, j'ajoute au fichier de mise en page xml tout ce qui pourrait être utilisé! Ensuite, à partir du code source de l'activité spécifique, j'obtiens l'objet par son identifiant et je "joue" avec la méthode de visibilité.

Voici un exemple:

((Spinner)findViewById(R.id.email_spinner)).setVisibility(View.GONE);

J'ai utilisé ce code (ou très similaire) pour ajouter plusieurs TextViews à un LinearLayout:

// Quick & dirty pre-made list of text labels...
String names[] = {"alpha", "beta", "gamma", "delta", "epsilon"};
int namesLength = 5;

// Create a LayoutParams...
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
    LinearLayout.LayoutParams.WRAP_CONTENT, 
    LinearLayout.LayoutParams.FILL_PARENT);

// Get existing UI containers...
LinearLayout nameButtons = (LinearLayout) view.findViewById(R.id.name_buttons);
TextView label = (TextView) view.findViewById(R.id.master_label);

TextView tv;

for (int i = 0; i < namesLength; i++) {
    // Grab the name for this "button"
    final String name = names[i];

    tv = new TextView(context);
    tv.setText(name);

    // TextViews CAN have OnClickListeners
    tv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            label.setText("Clicked button for " + name); 
        }
    });

    nameButtons.addView(tv, params);
}

La principale différence entre cela et le code de dicklaw795 est qu'il ne définit pas () et ne récupère pas () l'ID de chaque TextView - je l'ai trouvé inutile, bien que j'en ai peut-être besoin pour identifier plus tard chaque bouton dans une routine de gestionnaire commune ( par exemple un appelé par onClick () pour chaque TextView).

Button btn = new Button(this);
btn.setText("Submit");
LinearLayout linearLayout = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams buttonlayout = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
linearLayout.addView(btn, buttonlayout);

Button myButton = new Button(this);
myButton.setId(123);
myButton.setText("Push Me");


LinearLayout ll = (LinearLayout)findViewById(R.id.buttonlayout);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
ll.addView(myButton, lp);
 myButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                Toast.makeText(DynamicLayout.this,
                        "Button clicked index = " + id_, Toast.LENGTH_SHORT)
                        .show();
            }
        });

Si vous souhaitez ajouter des boutons dynamiquement, essayez ceci:

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    for (int i = 1; i <= 5; i++) {
        LinearLayout layout = (LinearLayout) findViewById(R.id.myLinearLayout);
        layout.setOrientation(LinearLayout.VERTICAL);
        Button btn = new Button(this);
        btn.setText("    ");
        layout.addView(btn);
    }

}

Vous pouvez créer une mise en page de base pour votre bouton et modifier dynamiquement uniquement ce qui est spécifique, comme ce projet que j'ai réalisé pour exécuter différents exercices d'un cours de conception de matériaux que je suis:

Dans cet exemple, j'utilise un AppCompatButton préconfiguré:

layout_base_button.xml

<android.support.v7.widget.AppCompatButton
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/btn_base"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_marginTop="8dp"
    style="@style/RaisedButton"
    >

</android.support.v7.widget.AppCompatButton>


<style name="RaisedButton" parent="Widget.AppCompat.Button.Colored">
    <item name="android:textSize">11sp</item>
    <item name="android:textStyle">bold</item>
</style>

Et dans le MainActivityj'ai créé quelques instances et changé ce dont j'ai besoin, comme le texte du bouton et l'événement onClick:

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="udemy.android.materialdesign.MainActivity">

    <LinearLayout
        android:id="@+id/base_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

    </LinearLayout>


</ScrollView>



public class MainActivity extends AppCompatActivity {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LinearLayout baseLayout = findViewById(R.id.base_layout);

        baseLayout.addView(createButton("TextFields", baseLayout,
                view -> startActivity(createIntent(TextFieldsActivity.class))
        ));

        baseLayout.addView(createButton("Buttons", baseLayout,
                view -> startActivity(createIntent(ButtonsActivity.class))
        ));

        baseLayout.addView(createButton("Toolbar", baseLayout,
                view -> startActivity(createIntent(ToolbarActivity.class))
        ));

    }

    private View createButton(String text, LinearLayout baseLayout, View.OnClickListener onClickEvent) {
        View inflated = LayoutInflater.from(this).inflate(R.layout.layout_base_button, baseLayout, false);
        AppCompatButton btnBase = inflated.findViewById(R.id.btn_base);

        btnBase.setText(text);
        btnBase.setOnClickListener(onClickEvent);
        return btnBase;
    }

    private Intent createIntent(Class<?> cls) {
        return new Intent(this, cls);
    }
}

Désolé d'être en retard ...

Par mainactivity.xmlécrit:

<Button
    android:id="@+id/search"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Search" 
    android:visibility="invisible"/>

Par main.javaécrit:

Button buttonSearch;
buttonSearch = (Button)findViewById(R.id.search);
buttonSearch.setVisibility(View.VISIBLE);