Android 代码实现Layout控件编程

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本例程通过代码编写的方法实现了LinearLayout,ImageView,TextView,Button等等View及控件的编写，感觉跟Java GUI编程有点类似，先实现个Panel于丹

package shortcut.song.com.myapplication;import android.graphics.Color;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.Toast;public class CodeLayoutActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        LinearLayout root = new LinearLayout(this);        root.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,                    ViewGroup.LayoutParams.MATCH_PARENT));        root.setOrientation(LinearLayout.VERTICAL);//设置LinearLayout排列方式为垂直排列        //root.setGravity(Gravity.CENTER); //居中显示        //root.setGravity(Gravity.CENTER_HORIZONTAL);//水平居中显示        //root.setGravity(Gravity.TOP); //居顶显示        //root.setGravity(Gravity.BOTTOM);//居底显示        //root.setGravity(Gravity.LEFT);//居左显示        //root.setGravity(Gravity.RIGHT);//居右显示        //root.setGravity(Gravity.START);//        //root.setGravity(Gravity.END);        root.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);        ImageView mImageView = new ImageView(this);        mImageView.setImageResource(R.drawable.img3);        TextView mTextView = new TextView(this);        mTextView.setText("Code Layout Text");        mTextView.setTextColor(Color.BLUE);        mTextView.setTextSize(12);        Button mButton = new Button(this);        mButton.setText("CodeButton");        mButton.setWidth(200);        mButton.setHeight(25);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(CodeLayoutActivity.this, "Button is Clicked", Toast.LENGTH_SHORT).show();            }        });        //将代码生成的控制添加到root        root.addView(mImageView);        root.addView(mTextView);        root.addView(mButton);        setContentView(root); //重要，设置Activity显示内容为 root    }}

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