Question

public class MainActivity extends Activity {
    int i,j;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.HORIZONTAL);
        layout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
        LinearLayout layout2 = new LinearLayout(this);
        layout2.setOrientation(LinearLayout.HORIZONTAL);
        layout2.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
        LinearLayout layout1 = new LinearLayout(this);
        layout1.setOrientation(LinearLayout.VERTICAL);
        layout1.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));

                    for(j=0;j<5;j++){
                Button myButton = new Button(this);
                myButton.setText(""+j);
                myButton.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
                myButton.setTextSize(20);
                layout.addView(myButton);                   
        }
                    layout1.addView(layout);
                    for(j=5;j<10;j++){
                        Button myButton = new Button(this);
                        myButton.setText(""+j);
                        myButton.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
                        myButton.setTextSize(20);
                        layout2.addView(myButton);                      
                }
                    layout1.addView(layout2);

        setContentView(layout1);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

以上是我的代码。我能够动态创建两行5列的按钮。但在这里我必须手动创建行的布局（布局，布局2）。我以为我会定义一个linearlayout数组。但是，当我尝试指定setOrientation和setLayoutParams时程序崩溃。我试过了

layout3[0].setOrientation(LinearLayout.HORIZONTAL);

但程序崩溃了。

Answer 1

实际上很简单

您需要指定

layout3[i] = new LinearLayout(this);
            layout3[i].setOrientation(LinearLayout.HORIZONTAL);
            layout3[i].setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));

然后它有效。

在Android上动态添加按钮作为行和列？

1 个答案: